First Line Leakproof Bikini
With built-in leak protection for light days and incontinence, you’ll be able to rest, move, and breathe easy. And hey — they’re antibacterial and odor-repellent, all while looking and feeling just like your favorite Tomboys. Plus, the outside fabric is also leak resistant for even more protection.
First Line underwear is made with OEKO-TEX® 100 Certified fabrics which are free from chemicals that are toxic to humans including PFOS and PFOA chemicals that have been shown to cause infertility or cancer. Learn more.
- Fit-tested on all body types, sizes 3XS-6X
- Looks and fits just like regular TomboyX Underwear
- 95% OEKO-TEX®-certified cotton, 5% spandex
- Holds 8 tsps of liquid
- Signature stay-put rainbow waistband
- Smooth, durable flatlock seams won’t irritate or chafe
- Machine wash cold in a mesh bag, line dries overnight. Avoid machine drying.
Fabrics & Technology
Our classic soft jersey knit holds its shape after many wear and care cycles.Shop Cotton
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Quick-drying, durable and ultralight performance fabric. Anti-bacterial and anti-microbial.Shop Traveler
First Line Leakproof
Your first line of defense — our classic cotton armed with leak protection for light period days and incontinence.Shop First Line