tomboyx | Premium Underwear for All Day Comfort. Fit for You.

Swim 6" Racerback Unisuit

Swim 6" Racerback Unisuit - Main image
$74.25 $99 In stock

Category: swimwear

Reveal an aquatic surprise with our water-activated fabric. When dry, black keeps its secrets hidden. But splash some water on it, and watch as gray jellies emerge.

How It Works

Our innovative color-changing technology responds to water contact. The moment moisture hits the fabric, the previously invisible jellyfish print transforms from black to gray. Once dry, the fabric returns to its sleek, all-black appearance—ready to surprise again and again.

No pinching. No riding up. Just an A+ full coverage swimsuit with squirm-free on & off. Yes, please.

Sustainability note: We recycle 14 water bottles to make each racerback unisuit

  • 6” inseam
  • Half-moon neckline with racerback in back
  • UPF 50
  • Shell: 80% recycled polyester; 20% spandex,
  • Lining: 88% polyester; 12% spandex
  • OEKO-TEX Certified
  • Inclusive sizing from XS-6X
Before you pay

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When it ships

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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If you need a refund

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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.4 / 5 · 5 reviews)

Daniel M. ★★★★★

The water-activated jellies are such a fun surprise—I caught myself splashing water just to watch them appear again. The racerback cut fits snugly without digging in, and it’s comfortable enough for a long swim.

Samuel ★★★★★

The fabric change when it gets wet is such a fun surprise—I kept splashing water on myself just to watch the jellies appear again. The racerback fit is snug but not restrictive, and it dried off pretty quickly after my swim.

Abigail ★★★★★

The water-activated reveal is even cooler in person — I splashed it in the pool and the gray jellies popped instantly, way better than I expected. The racerback fit stays put during laps, and the 6" inseam feels just right for coverage without riding up.