Modibodi

Most period swimwear doesn't wear out — the dryer and fabric softener kill it. The exact wash routine that keeps the gusset absorbent, and why it starts to smell.

The PFAS lawsuits were about period underwear — not swimwear, which almost no lab has tested. How to read a "PFAS-free" swimsuit claim, and whose evidence actually holds up.

Why does most period swimwear leak on a heavy day? The suits that actually hold, the teen, budget and backup picks, and the "pink puddle" physics other guides skip.

No swimsuit survives a heavy day-1 alone — the highest-capacity period swimwear, why you also need a menstrual disc, and the double-up that gets you through the water.

Does period swimwear actually work underwater? Why it absorbs blood but can't keep pool water out — and what that "pink puddle" really is.

The drag-suit trick competitive swimmers use to train on their period — how underswimming works, and the lowest-drag period bottoms for the pool.

An honest look at Beautikini, the budget Amazon period swimsuit brand — how its leak-proof gusset really works, who it's for (teens, light-to-moderate flow), and where it fits among the better-known options.

A materials-led deep dive into how leak-proof period swimwear actually works — the absorbent-layer science, the honest "pink-puddle" physics, and a style guide for matching silhouette and flow. Brands compared: Modibodi, WUKA, Knix, The Period Company and more.