Regular price Sale price $39 USD

Buy 4+ and save 20%

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Regular price Sale price $39 USD

Buy 4+ and save 20%

heavy Absorbency holds up to 4 regular tampons

Color Black
HSA/FSA Approved

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60 Day Money-Back Guarantee


Our Leakproof Bikini Period Underwear is a classic style in a mid-rise fit and features a high leg opening. With extended leak protection perfect for heavy flows, this style gives you peace of mind from day to night. Wake up in stain-free sheets thanks to our patented Leak-Loc® absorbent core technology that helps you feel confident.


Absorbs heavy periods, sweat, and discharge

Features a mid-rise fit with moderate coverage

Holds up to 4 regular tampons

Washer friendly, hang to dry


Outer: 75% Nylon 25% Spandex
Body Lining: 100% Cotton
Top Lining: 100% Polyester
Interlining: 68% Polyester 28% Cotton 4% Acrylate
Bottom Lining: 100% Polyester

Care Instructions:
Reusable & machine washable: When you're done wearing, simply wash with cold water and gentle detergent, then hang or lay flat to dry


Absorbent Zone; Extended
Front-to-back lining protection additional waterproof layer for our maximum protection with multi-layer absorbent core
Leak-Loc® bonded edge technology

  • moisture-wicking top layer
  • absorbent core
  • waterproof liner
  • waterproof outer fabric
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What is bikini style underwear?

The bikini undies by Proof feature a mid-rise fit, high cut leg opening, and moderate coverage, all in a comfortable stretch fabric that moves with your body.

What is the difference between brief and bikini underwear?

The bikini features a high-leg opening and narrow sides, with a mid-rise and moderate back coverage. The brief is designed with wider sides, lower rise, and moderate back coverage.

Is this undie best suited for heavy periods?

The Leakproof Bikini by Proof is perfect for heavy periods. It holds up to 4 regular tampons and is equipped with front-to-back, extended leakproof protection.