Skip navigation

GET $40 OFF your next purchase when you apply and get approved for a Nordstrom credit card. Restrictions apply. Apply Now

Sign In

  • All Clearance
  • Clearance Under $25

  • New Markdowns

  • Women
  • Men
  • Kids
  • Shoes
  • Bags & Accessories
  • Home
  • Beauty
  • Women

  • Clothing
  • Shoes
  • Handbags
  • Accessories
  • Jewelry
  • Beauty
  • Men

  • Clothing
  • Shoes
  • Accessories
  • Kids

  • Girls' Clothing
  • Girls' Shoes
  • Boys' Clothing
  • Boys' Shoes
  • Baby
  • Bags & Accessories

  • Shoes

  • Designer

  • Home

  • Beauty

Shop Now
  • All New & Now
  • Father's Day Gifts

  • Summer Style Essentials

  • New From Our Top Brands

  • Top 100 Deals

  • Just Landed from Nordstrom

  • Linen Shop

  • Vacation & Resort

  • Women

  • Clothing
  • Shoes
  • Handbags
  • Jewelry & Watches
  • Accessories
  • Men

  • Clothing
  • Shoes
  • Accessories
  • Kids

  • Girls
  • Boys
  • Baby
  • Home

  • Beauty

  • Trending

  • Women's Bold Color
  • Women's Preppy Style
  • Women's Ruffle & Lace Details
  • Men's Baggy Jeans
  • Men's Preppy Style
  • Jelly Shoes
  • Beaded Accessories
  • Coastal Chic Accessories
  • Soccer Style
  • Flash Events

  • Marc Jacobs Up to 50% Off
  • Diane von Furstenberg Up to 60% Off
Father's Day Gifts
  • All Women
  • New Arrivals

  • Best Sellers

  • Summer Essentials

  • Linen Shop

  • Trending: Preppy Style

  • Trending: Ruffle & Lace Details

  • Trending: Bold Colors

  • Nordstrom Made

  • Clearance

  • Clothing

  • Activewear
  • Coats & Jackets
  • Dresses
  • Jeans & Denim
  • Jumpsuits & Rompers
  • Lingerie, Hosiery & Shapewear
  • Matching Sets
  • Pajamas & Loungewear
  • Pants & Leggings
  • Shorts
  • Skirts
  • Suits & Separates
  • Sweaters
  • Sweatshirts & Hoodies
  • Swimsuits & Cover-Ups
  • Tops
  • Plus-Size Clothing
  • Shoes

  • Athletic & Sneakers
  • Boots & Booties
  • Comfort
  • Flats
  • Heels
  • Loafers
  • Oxfords
  • Sandals
  • Slippers
  • Handbags

  • Sunglasses & Eyewear

  • Jewelry & Watches

  • Accessories

  • Beauty

  • Shop by Occasion

  • Concert & Festival
  • Night Out
  • Vacation & Resort
  • Wear to Work
  • Wedding Guest
  • Designer

  • Contemporary

  • Young Adult

Shop Now
  • All Men
  • Father's Day Gifts

  • New Arrivals

  • Best Sellers

  • Linen Shop

  • Golf Shop

  • Summer Essentials

  • Sunglasses Under $100

  • Trending: Baggy Jeans

  • Trending: Preppy Style

  • Clearance

  • Clothing

  • Activewear
  • Blazers & Sport Coats
  • Coats & Jackets
  • Dress Shirts
  • Jeans & Denim
  • Joggers & Sweatpants
  • Lounge, Pajamas & Robes
  • Pants
  • Polo Shirts
  • Shirts
  • Shorts
  • Suits & Separates
  • Sweaters
  • Sweatshirts & Hoodies
  • Swimwear & Board Shorts
  • T-Shirts
  • Underwear & Socks
  • Shoes

  • Athletic & Sneakers
  • Boots
  • Comfort
  • Designer
  • Dress Shoes
  • Loafers & Slip-Ons
  • Oxfords & Derbys
  • Sandals & Flip-Flops
  • Slippers
  • Accessories

  • Bags & Backpacks
  • Belts & Suspenders
  • Hats
  • Sunglasses & Eyewear
  • Ties & Pocket Squares
  • Watches
  • Dresswear Shop

  • Contemporary

  • Designer

  • Young Adult

  • Big & Tall

  • Grooming & Cologne

  • Shop by Occasion

  • Concert & Festival Outfits
  • Vacation & Resort
Shop Vacation
  • All Kids
  • Back to School: Kids

  • New Arrivals

  • Best Sellers

  • Swim Shop

  • Kids' Matching Sets

  • Kids' Value Packs

  • Summer Essentials

  • Sneakers Under $25

  • Clearance

  • Girls' Clothing

  • Toddler Girls (Sizes 2T-4T)
  • Little Girls (Sizes 4-6x)
  • Girls & Tweens (Sizes 7-20)
  • Girls' Accessories

  • Boys' Clothing

  • Boys (Sizes 4-7)
  • Boys (Sizes 8-20)
  • Toddler Boys (Sizes 2T-4T)
  • Boys' Accessories

  • Baby Apparel & Accessories

  • Baby Girl Clothing (0-24M)
  • Baby Boy Clothing (0-24M)
  • Unisex Baby Clothing (0-24M)
  • Baby Gear & Essentials
  • Baby Shower Gifts
  • Baby's First
  • Kids' Shoes

  • Baby & Walker Shoes
  • Toddler (Sizes 7.5-12)
  • Little Kid (Sizes 12.5-3)
  • Big Kid (Sizes 3.5-7)
  • Girls' Shoes
  • Boys' Shoes
  • Shop by Occasion

  • Special Occasion
  • Vacation & Resort
  • Toys

  • Disney & Character Shop

Kids' Sneakers
  • All Shoes
  • Back to School for All: Shoes

  • New Arrivals

  • Best Sellers

  • Party Shoes

  • Trending: Jelly Shoes

  • Trending: Western Boots

  • Sandals Under $50

  • Contemporary Brands

  • Designer Brands

  • Golf Shoes

  • Summer Essentials

  • Clearance

  • Women's Shoes

  • Athletic & Sneakers
  • Boots
  • Booties
  • Clogs
  • Comfort
  • Flats
  • Heels
  • Loafers
  • Mules
  • Oxfords
  • Sandals
  • Slippers
  • Extended Sizes & Widths
  • Men's Shoes

  • Athletic & Sneakers
  • Boots
  • Comfort
  • Designer
  • Dress Shoes
  • Loafers & Slip-Ons
  • Oxfords & Derbys
  • Sandals & Flip-Flops
  • Slippers
  • Extended Sizes & Widths
  • Kids' Shoes

  • Baby & Walker Shoes
  • Toddler (Sizes 7.5-12)
  • Little Kid (Sizes 12.5-3)
  • Big Kid (Sizes 3.5-7)
  • Girls' Shoes
  • Boys' Shoes
  • Athletic & Sneakers
  • Boots
  • Dress
  • Sandals
  • Kids' Shoes Size Chart

  • Shoe Care & Accessories

Shop Sandals
  • All Bags & Accessories
  • New Arrivals

  • Best Sellers

  • Travel Must-Haves

  • Trending: Beaded Accessories

  • Trending: Coastal Chic

  • Designer Sunglasses Under $200

  • Handbags Under $100

  • Watches Under $200

  • Clearance

  • Women's Accessories

  • Belts
  • Hats
  • Sarongs, Caftans & Cover-Ups
  • Scarves
  • Women's Handbags

  • Backpacks
  • Bag Charms
  • Clutches & Pouches
  • Crossbody Bags
  • Shoulder Bags
  • Tote Bags
  • Wallets
  • Women's Jewelry

  • Bracelets
  • Earrings
  • Jewelry & Watch Sets
  • Necklaces
  • Rings
  • Women's Fine Jewelry

  • Bracelets
  • Earrings
  • Necklaces
  • Rings
  • Under $150
  • Men's Accessories

  • Bags & Backpacks
  • Belts & Suspenders
  • Hats
  • Jewelry & Cufflinks
  • Wallets & Card Cases
  • Sunglasses & Eyewear

  • Watches

  • Luggage & Travel

  • Carry-On
  • Checked Luggage
  • Hardside Luggage
  • Softside Luggage
  • Designer

  • Designer Handbags
  • Designer Sunglasses & Eyewear
  • Designer Watches
  • Nordstrom Made

Shop Sunglasses
  • All Beauty
  • Father's Day Cologne & Grooming Gifts

  • New Arrivals

  • Best Sellers

  • Top Rated Beauty

  • Beauty Deals Up to 60% Off

  • Beauty Under $25

  • Summer Beauty Must-Haves

  • Clearance

  • Fragrance

  • Body Mist & Hair Mist
  • Candles & Diffusers
  • Cologne
  • Designer Fragrance
  • Fragrance Gift Sets
  • Perfume
  • Roller Ball & Travel Size
  • Makeup

  • Eyes
  • Face
  • Lips
  • Tools & Brushes
  • Bath & Body

  • Skin Care

  • Cleansers
  • Eye Creams & Treatments
  • Face Mists & Toners
  • Facial Masks
  • Moisturizers
  • Serums
  • Sunscreen
  • Tools & Devices
  • Hair Care

  • Hair & Scalp Treatments
  • Hair Accessories
  • Hair Dryers & Styling Tools
  • Hairstyling Products
  • Shampoo & Conditioner
  • Textured Hair Care
  • Gifts & Sets

  • Travel & Mini Sizes

  • Designer Beauty

  • Brushes, Tools & Devices

  • Men's Grooming & Cologne

  • Oral Care

  • Nails

  • Wellness & Self-Care

  • KBeauty

  • FSA/HSA Eligible Beauty

  • Top Brands

  • Anastasia Beverly Hills
  • Burberry
  • Calvin Klein
  • Charlotte Tilbury
  • Clinique
  • Dolce & Gabbana
  • Gucci
  • Kitsch
  • L'Occitane
  • Le Monde Gourmand
  • MAC Cosmetics
  • Marc Jacobs
  • NEST New York
  • Too Faced
Fragrance
  • All Home
  • Father's Day Home Gifts

  • New Arrivals

  • Best Sellers

  • Outdoor Living

  • Home Decor Under $50

  • Travel Must-Haves

  • Home Refresh

  • Cozy Home Shop

  • Housewarming Gifts

  • Wedding & Engagement Gifts

  • Clearance

  • Bedding

  • Comforters & Sets
  • Duvet Covers & Inserts
  • Pillows
  • Quilts
  • Sheet Sets
  • Blankets & Throws

  • Bath

  • Bath Rugs & Mats
  • Bath Towels
  • Bathroom Decor
  • Shower Curtains
  • Home Decor

  • Candles & Diffusers
  • Decorative Accessories
  • Decorative & Throw Pillows
  • Faux Plants & Stands
  • Rugs & Doormats
  • Kitchen & Tabletop

  • Bar Accessories
  • Cookware & Bakeware
  • Cutlery & Kitchen Knives
  • Drinkware & Glassware
  • Meal Prep
  • Small Appliances
  • Luggage & Travel

  • Electronic & Tech Accessories

  • Water Bottles & Tumblers

  • Storage & Cleaning

  • Pet Accessories

  • Nordstrom Made

Shop Now
  • All Gifts
  • Top Rated Gifts

  • Gift Cards

  • Father's Day Gifts

  • Top 100 Gifts
  • Golf & Active Gifts
  • Watches & Accessory Gifts
  • Cologne & Grooming Gifts
  • Tech, Lounge & Home Gifts
  • Gifts by Recipient

  • Gifts for Her
  • Gifts for Him
  • Gifts for Kids & Babies
  • Gifts for Teens
  • Gifts for the Home
  • Gifts for the One Who Has Everything
  • Gifts by Price

  • Gifts Under $25
  • Gifts Under $50
  • Gifts Under $100
  • Luxe & Designer
  • Gifts by Occasion

  • Baby Shower Gifts
  • Bridesmaid Gifts
  • Groomsmen Gifts
  • Housewarming Gifts
  • Wedding & Engagement Gifts
Father's Day Gifts
Main content
  1. Home
  2. Men
  3. Clothing
  4. Coats & Jackets
Represent Embroidered Logo Tape Stripe Track Jacket, Main, color, Jet Black
Represent Embroidered Logo Tape Stripe Track Jacket, Alternate, color, Jet Black
Represent Embroidered Logo Tape Stripe Track Jacket, Alternate, color, Jet Black
Represent Embroidered Logo Tape Stripe Track Jacket, Alternate, color, Jet Black
Represent Embroidered Logo Tape Stripe Track Jacket, Alternate, color, Jet Black
Represent Embroidered Logo Tape Stripe Track Jacket, Alternate, color, Jet Black

Embroidered Logo Tape Stripe Track Jacket

Represent

$127.97Current Price $127.97
(49% off)49% off.
$255.00Comparable value $255.00
Color: Jet Black
The brand says this runs true to size.​
Size
GET $40 OFF next purchase + 5% off every Rack purchase with a Nordstrom credit card. Terms apply. Apply Now

Similar items you might like

  • Represent Oversize Plaid Faux Fur Magnetic Snap Shirt Jacket
    Represent
    $155.97Current Price $155.97
    $310.00Comparable value $310.00
  • RtA Danny Denim Trucker Jacket
    RtA
    $129.97Current Price $129.97
    $345.00Comparable value $345.00
  • Off-White Pixel Diagonal Skate Hoodie
    Off-White
    $289.97Current Price $289.97
    $975.00Comparable value $975.00
  • AllSaints Aerial Slim Fit Organic Cotton Shirt Jacket
    New Markdown
    AllSaints
    $67.47 – $109.97Current Price $67.47 to $109.97
    $169.00 – $179.00Comparable value $169.00 to $179.00
See More

Details & care

Sporty striped tape runs collar to cuffs on this heritage-look track jacket featuring secure zip pockets and classically embroidered branding at the chest.

  • Two-way front-zip closure
  • Stand collar
  • Vertical side-zip pockets
  • Ribbed cuffs and hem
  • 97% polyester, 3% elastane
  • Machine wash, line dry
  • Imported
  • Item #11083840

Size info

  • The brand says this runs true to size.​

Shipping & returns

This item qualifies for free shipping on orders over $89. View Shipping & Returns Policy.

This item is returnable within 40 days by mail or to U.S. Nordstrom Rack and U.S. Nordstrom stores. All beauty items are only eligible for return in U.S. Nordstrom Rack or U.S. Nordstrom stores.

Gift options

Write a gift message at Checkout and we'll email it to the recipient when their item is delivered
Need help finding the perfect gift? We've got you covered.
Shop Gifts

Reviews

(0)
No reviews yet–be the first!
Write a Review

Outfit Ideas For This Item

  • Style idea 1
    New Balance Sport Essentials AD Graphic T-Shirt
    New Balance
    PURPLE BRAND Logo Cotton Fleece Shorts
    PURPLE BRAND
    Saint Laurent 56mm Square Sunglasses
    Saint Laurent
    Represent Embroidered Logo Tape Stripe Track Jacket
    Represent
    Nike V5 RNR Sneaker
    Nike
  • Style idea 2
    NN07 Adwin 5292 Plaid Organic Cotton Flannel Button-Up Shirt
    NN07
    Represent Embroidered Logo Tape Stripe Track Jacket
    Represent
    Emporio Armani Chronograph Leather Strap Watch, 46mm
    Emporio Armani
    Hudson Jeans Luca Wide Leg Cotton Jeans
    Hudson Jeans
    Vince Montebello Loafer
    Vince
  • Style idea 3
    New Balance Athletics Prep Rally Graphic T-Shirt
    New Balance
    Reigning Champ Recovery Brushed Jersey Shorts
    Reigning Champ
    Nike Reversible Carbon Fiber Textured Belt
    Nike
    Represent Embroidered Logo Tape Stripe Track Jacket
    Represent
    Veja Wata II Ripstop High Top Sneaker
    Veja
  • Style idea 4
    PURPLE BRAND Cutoff Denim Shirt Jacket
    PURPLE BRAND
    Represent Embroidered Logo Tape Stripe Track Jacket
    Represent
    Emporio Armani Chronograph Bracelet Watch, 43mm
    Emporio Armani
    Helmut Lang Worker Organic Cotton Straight Leg Jeans
    Helmut Lang
    Vince Taro Loafer
    Vince
  • Style idea 5
    adidas Oversize T-Shirt
    adidas
    RtA Joseph Denim Cargo Shorts
    RtA
    Nike Pebble Grain Faux Leather Belt
    Nike
    Represent Embroidered Logo Tape Stripe Track Jacket
    Represent
    Nike V5 Runner Sneaker
    Nike
  • Style idea 6
    ICECREAM Worldwide Moto Long Sleeve Graphic T-Shirt
    ICECREAM
    SANTO STUDIO Blake Snell Tempo Lite Shorts
    SANTO STUDIO
    Nike NV03 55mm Rectangular Sunglasses
    Nike
    Represent Embroidered Logo Tape Stripe Track Jacket
    Represent
    Veja V-10 Low Top Sneaker
    Veja
  • Style idea 7
    rag & bone Matthew Stripe Pocket T-Shirt
    rag & bone
    Nike Club Utility Shorts
    Nike
    Nike Perforated Reversible Belt
    Nike
    Represent Embroidered Logo Tape Stripe Track Jacket
    Represent
    adidas Lightblaze Vista Sneaker
    adidas

New Arrivals

  • Represent x Realtree Camo Print Trucker Jacket
    New
    Represent
    $127.97Current Price $127.97
    (62% off)62% off.
    $345.00Comparable value $345.00
  • SANTO STUDIO Uno Tweed Jacket
    New
    SANTO STUDIO
    $139.97Current Price $139.97
    (50% off)50% off.
    $280.00Comparable value $280.00
  • Nike Golf Tour Essential Water-Repellent Golf Jacket
    New
    Nike Golf
    $66.00Current Price $66.00
    (45% off)45% off.
    $120.00Previous Price $120.00
  • Billionaire Boys Club Space Suit Bomber Jacket
    New
    Billionaire Boys Club
    $199.97Current Price $199.97
    (48% off)48% off.
    $385.00Comparable value $385.00
  • Save The Duck Alexander Quilted Water Repellent Puffer Jacket
    New
    Save The Duck
    $88.97Current Price $88.97
    (35% off)35% off.
    $138.00Comparable value $138.00
    (1)
  • Bugatchi Soft Touch Snap-Up Shirt
    New
    Bugatchi
    $118.97Current Price $118.97
    (60% off)60% off.
    $298.00Comparable value $298.00
  • Maceoo Gene Blue Leather Jacket
    New
    Maceoo
    $299.97Current Price $299.97
    (59% off)59% off.
    $748.00Comparable value $748.00
    (1)
  • Reiss Barry Cotton Blend Jacket
    New
    Reiss
    $168.97Current Price $168.97
    (51% off)51% off.
    $345.00Comparable value $345.00
  • rag & bone Melrose Stretch Cotton Corduroy Zip Jacket
    New
    rag & bone
    $299.97Current Price $299.97
    (49% off)49% off.
    $598.00Comparable value $598.00
  • Billionaire Boys Club Puffer Baseball Jacket
    New
    Billionaire Boys Club
    $164.97Current Price $164.97
    (49% off)49% off.
    $325.00Comparable value $325.00
    (1)
  • Michael Kors Rib Hem Zip Softshell Jacket
    New
    Michael Kors
    $84.97Current Price $84.97
    (56% off)56% off.
    $195.00Comparable value $195.00
  • Nike Sportswear Tech Windrunner Jacket
    New
    Nike
    $79.97Current Price $79.97
    (38% off)38% off.
    $130.00Comparable value $130.00
    (2)
  • Maceoo Embroidered Sleeve Leather Bomber Jacket
    New
    Maceoo
    $299.97Current Price $299.97
    (59% off)59% off.
    $748.00Comparable value $748.00
    (1)
  • AGOLDE Torres Corduroy Bomber Jacket
    New
    AGOLDE
    $219.97Current Price $219.97
    (64% off)64% off.
    $628.00Comparable value $628.00
  • Robert Barakett Henrik Lightweight Baseball Jacket
    New
    Robert Barakett
    $68.97Current Price $68.97
    (65% off)65% off.
    $198.00Comparable value $198.00
  • UNTUCKit Braunfield Quilted Knit Overshirt
    New
    UNTUCKit
    $74.97Current Price $74.97
    (49% off)49% off.
    $148.00Comparable value $148.00
    (1)
  • Save The Duck Alter Waterproof Hooded Puffer Jacket
    New
    Save The Duck
    $404.60Current Price $404.60
    (30% off)30% off.
    $578.00Previous Price $578.00
  • Save The Duck Sid Twill Jacket with Removable Hood
    New Markdown
    Save The Duck
    $267.15Current Price $267.15
    (52% off)52% off.
    $568.00Comparable value $568.00
  • Schott NYC Cotton Corduroy Trucker Jacket
    New
    Schott NYC
    $68.97Current Price $68.97
    (55% off)55% off.
    $155.00Comparable value $155.00
  • Save The Duck Ari Water Resistant Puffer Jacket
    New Markdown
    Save The Duck
    $106.99Current Price $106.99
    (55% off)55% off.
    $238.00Previous Price $238.00
    (3)
  • Billionaire Boys Club BB Lynx Lined Denim Jacket
    New
    Billionaire Boys Club
    $154.97Current Price $154.97
    (45% off)45% off.
    $285.00Comparable value $285.00
  • Ksubi Studded Logo Hooded Jacket
    New
    Ksubi
    $219.97Current Price $219.97
    (50% off)50% off.
    $440.00Comparable value $440.00
  • Save The Duck Alexander Quilted Water Resistant Insulated Puffer Jacket
    New
    Save The Duck
    $98.97Current Price $98.97
    (50% off)50% off.
    $198.00Comparable value $198.00
  • PURPLE BRAND Cropped Carpenter Jacket
    New
    PURPLE BRAND
    $199.97Current Price $199.97
    (55% off)55% off.
    $450.00Comparable value $450.00
See More
Earn a $25 or $50 promo card when you buy $150 or $250 in gift cards online. Ends June 21.Earn a $25 or $50 promo card when you buy $150 or $250 in gift cards online. Ends June 21.

Treat Dads & Grads: Earn a $25 or $50 Promo Card

When you buy $150 or $250 in gift cards online. Promo card will be emailed around July1 and is good through August 9. Restrictions apply.
Shop Gift CardsSee Restrictions
Download the Nordstrom Rack app.Download the Nordstrom Rack app.

Download Our App

And save big with alerts on price drops, new arrivals and more. Plus, Nordy Club members can access new app-exclusive perks!
Download Our App
Get free shipping on most orders over $89.Get free shipping on most orders over $89.

Free Shipping on Most Orders over $89

Plus, 40-day returns: by mail or free to U.S. stores.
Learn More
Apply today: get $40 off your next purchase plus an extra five percent off for cardmembers. A hand holding a credit card.Apply today: get $40 off your next purchase plus an extra five percent off for cardmembers. A hand holding a credit card.

$40 Off Your Next Purchase

Just apply and get approved for a Nordstrom credit card. Plus, get 5% off every Rack purchase when you use your credit card. Terms apply.
Apply Now
Help support Operation Warm. Two little girls smiling and wearing colorful coats.Help support Operation Warm. Two little girls smiling and wearing colorful coats.

Help Rack Help Kids

Join us in supporting Operation Warm, a nonprofit giving brand-new shoes and coats to kids.
Learn More & Donate Now

Get Rack Emails

Get the good stuff—new arrivals from Nordstrom, new markdowns, private sales and more.
Learn More
A new Rack store.A new Rack store.

New Nordstrom Rack Stores

Is your neighborhood on the list?
Find Your New Rack
Anniversary Sale Coming Soon. Starts July 18.Anniversary Sale Coming Soon. Starts July 18.

Save the Date: Nordstrom Sale Starts July 18

Get your wish list ready! Preview the deals on July 6 at noon ET. Cardmembers shop as early as July 14. New arrivals. Sale prices. Let’s party!
Learn More

You're in!

Stay tuned for the latest updates on new arrivals, special offers and more - all delivered straight to your inbox.

Privacy Policy

Get Email Updates:

Customer Service

  • Order Status
  • Guest Returns
  • Shipping & Return Policy
  • Gift Cards
  • Product Recalls
  • FAQ
  • Contact Us

About Us

  • About Our Brand
  • The Nordy Club
  • Store Locator
  • All Brands
  • Careers
  • Get Email Updates
  • Nordy Podcast
  • Store Openings

Nordstrom Rack & the Community

  • Our Impact
  • People & Culture

Nordstrom Card

  • Apply for a Nordstrom Card
  • Pay My Bill
  • Manage My Nordstrom Card

Nordstrom, Inc.

  • Nordstrom
  • HauteLook
  • Investor Relations
  • Press Releases
  • Nordstrom Media Network
Download Our App
  • Privacy
  • Your Privacy Rights
  • Terms & Conditions
  • California Supply Chains Act
  • ©2026 Nordstrom Rack