This site has limited support for your browser. We recommend switching to Edge, Chrome, Safari, or Firefox.

Start Earning Rewards Join the C-IN2 Circle

Free Shipping US orders over $99

Easy Returns Go to Returns Center
Subtotal Free
View cart
Shipping, taxes, and discount codes are calculated at checkout

Cart 0

No more products available for purchase

Products

International orders are final sale. For orders that are shipping to destinations outside of the United States (including Canada), you may have to pay duties and taxes to your country's government.

Your Cart is Empty

Layers Classic Ribbed Fitted Tank White - C - IN2 New York

Layers Classic Ribbed Fitted Tank White

Color: WHITE

$32.00 USD

Hand Me Down Crew Neck T-Shirt Smoke Heather

Hand Me Down Crew Neck T-Shirt Smoke Heather

Color: SMOKE HEATHER

$36.00 USD $45.00 USD
High Twist Summer Crew Neck T-Shirt Black - C - IN2 New York

RO3 High Twist Summer Crew Neck T-Shirt Black

Color: BLACK

$16.00 USD $40.00 USD
Layers Slim Crew Neck T-Shirt Black

Layers Slim Crew Neck T-Shirt Black

Color: BLACK

$32.00 USD $40.00 USD
Layers Slim Crew Neck T-Shirt White

Layers Slim Crew Neck T-Shirt White

Color: WHITE

$40.00 USD

The new shape of men’s fashion

Core Y - Back Thong White - C - IN2 New York
Core Y - Back Thong White - C - IN2 New York
Core Y - Back Thong White - C - IN2 New York
Core Y - Back Thong White - C - IN2 New York
Core Y - Back Thong White - C - IN2 New York
Core Y - Back Thong White - C - IN2 New York
4.8
Rated 4.8 out of 5 stars
198 Reviews

Core Y-Back Thong White

$26.00 USD
Item is in stock Hurry, Only 0 Left! Item is out of stock Item is unavailable
ColorWHITE
Size Size chart

True to size. For loose fit, go one size up.

Fit

12345
SmallTrue to sizeLarge
  • Description
  • Style and Fit
  • Fabric and Care
  • Shipping

One strap, zero lines — Y not?

The Y-back takes the thong one step further: a single elastic strap down the back, a sculpted pouch up front, and 100% cotton everywhere it touches. Barely there, completely comfortable — and nothing shows under anything.

Fabric
100% Cotton. Soft, breathable, and natural against the skin — the broken-in feel of a favorite tee, from the first wear.

Fit & Silhouette
Men's low-rise cotton Y-back thong — sits below the natural waist with a signature Y-back elastic strap and minimal coverage.

Contour Pouch
Sculpted 1-ply contour pouch with center-seam construction — light lift and natural shape, right where you want eyes to land.

Leg Openings
Clean elastic binding sits flat against the skin — no digging, nothing to adjust.

Waistband
1.5" exposed elastic waistband with repeat C-IN2 branding — the frame on a minimal canvas.

Fit note
True to size. For a looser fit, go one size up.

Care
Machine wash.
Imported.

Core

C-IN2's foundation — every essential silhouette, cut in soft, breathable 100% cotton that feels better the longer you own it. The drawer you build once and reach for every day.

Thong style underwear
Low-rise, sits below the natural waistline

Model's height is 6"1'/185 cm, and he is wearing size M.

100% cotton
Machine Wash
Imported

Get free shipping for US orders over $99.

Discreet packaging: plain poly bag or brown box.

For shipping info: C-IN2 Shipping.

Discreetly shipped in a plain brown box or poly bag.

SKU: 4002-100-XS

Complete the Set

Need help?

Send us an email at support@c-in2.com.

 [{"variant_id":"39720420016176" , "metafield_value":""},{"variant_id":"39720420048944" , "metafield_value":""},{"variant_id":"39720420081712" , "metafield_value":""},{"variant_id":"39720420114480" , "metafield_value":""},{"variant_id":"39720420147248" , "metafield_value":""},{"variant_id":"40257482686512" , "metafield_value":""},{"variant_id":"41003326537776" , "metafield_value":""}]
4.8
Rated 4.8 out of 5 stars
Based on 198 reviews
Total 5 star reviews: 171 Total 4 star reviews: 18 Total 3 star reviews: 2 Total 2 star reviews: 4 Total 1 star reviews: 3
95%would recommend these products
Reviews Summary
Customers say these Y-back thongs are incredibly comfortable and feel like wearing nothing at all. The Y-back design is more comfortable than traditional thong styles, with many noting the thin strap is less invasive. Users love the ample pouch space and support, finding them perfect for daily wear, sports, and gym activities. The soft material washes well and maintains durability. Many customers become repeat buyers and recommend sizing up for the best fit, though some find them true to size. A few mention sizing inconsistencies between colors and note the fabric can feel slightly stiff initially.
Customers Talked About
Write a Review (Opens in a new window)
198 reviews
  • CS
    Christopher S.
    Verified Buyer
    Reviewing
    Core Y-Back Thong White
    I recommend this product
    Body Type Short, Slim
    Height 5' 7-5' 9
    Normal Size Worn M
    Size in Other Brands M
    Size Bought S
    Rated 5 out of 5 stars
    2 weeks ago
    Comfortable and fun to wear

    Feels good on the body while providing freedom of movement

    Was this helpful?
  • CS
    Christopher S.
    Verified Buyer
    Reviewing
    Core Y-Back Thong Black
    I recommend this product
    Body Type Short, Slim
    Height 5' 7-5' 9
    Normal Size Worn M
    Size in Other Brands M
    Size Bought S
    Rated 5 out of 5 stars
    2 weeks ago
    Very comfortable and fun to wear.

    Very comfortable and fun to wear. It feels good on the body.

    Was this helpful?
  • DF
    don f.
    Verified Buyer
    Reviewing
    Core Y-Back Thong Black
    I recommend this product
    Body Type Muscular
    Height 5' 7-5' 9
    Normal Size Worn L
    Size in Other Brands L
    Size Bought L
    Rated 5 out of 5 stars
    3 weeks ago
    Core Y-Back Thong Black

    Takes care of my junk in a positive way

    Was this helpful?
  • RO
    Robert O.
    Verified Buyer
    Reviewing
    Core Y-Back Thong Black
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    This thong is incredibly comfortable

    This thong is incredibly comfortable and you dont really notice the Y string up the back. It was easy to put on the waistband doesnt bend or fold. It was a solid choice.

    Was this helpful?
  • PH
    Preston H.
    Verified Buyer
    Reviewing
    Core Y-Back Thong Black
    I recommend this product
    Rated 5 out of 5 stars
    4 months ago
    Super comfy

    Super comfy

    Was this helpful?
  • Related products
  • Recently viewed

Premium Basics, Engineered for Every Body

C-IN2 is a New York–born men’s underwear and apparel brand with one mission: to make every man look good and feel confident. We design premium basics and fashion-forward styles with innovative fabrics, engineered fits, and durable construction that lasts. Working closely with our partners, we create unique materials and refine every detail—from the cut of a t-shirt to the fit of a brief—to deliver comfort and style you can feel every day. Inclusive, empowering, and unapologetically bold—C-IN2 is made for every body.