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

Swim Racerback Zip Compression Top

Swim Racerback Zip Compression Top - Main image
$51.06 $69 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.

A classic tomboyx style, this sporty cut is designed to keep you active and on the move. Mesh-lined panels in the front provide support and pockets for removable foam cups. A full center zip makes it easy to take on and off. Top-to-bottom zipper guard protects skin from irritation. Full coverage fit means one less thing to worry about.

Sustainability note: We recycle 5 water bottles to make each swim top

  • Snug fit - order one size larger for a more relaxed fit
  • Light support with no underwire or padding
  • UPF 50
  • Antibacterial, odor resistant, breathable, and moisture wicking treatment
  • Smooth, durable flatlock seams won’t irritate or chafe
  • 80% polyester; 20% spandex
  • OEKO-TEX® Certified
  • Inclusive sizing from XS-6X
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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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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 (4.6 / 5 · 5 reviews)

Emma W. ★★★★★

I was skeptical the jellyfish print would look cheesy, but on the water-activated fabric it's surprisingly subtle and cool. The zip front makes it easy to get on and off after a swim, which I appreciate since racerbacks are usually a struggle.

Daniel H. ★★★★★

The compression fit is snug but not suffocating, and the zipper stays put even after a few laps. I tossed water on the chest when it was dry and the gray jellies popping out against the black genuinely made me laugh mid-swim.

Hannah ★★★★★

The water-activated jelly print is such a fun surprise—I kept splashing water on it just to watch them appear. The racerback and zip make it super easy to pull on and off, and it fits snug without digging in.