Period-Proof Bikini Swim Bottom, 4-Layer Leak-Proof Black

A period-proof bikini swim bottom (moonful) that looks like a regular bikini but works like a 2-tampon safety net. The mid-rise waist and high-cut legs sit like standard swimwear, while the reinforced crotch houses a 4-layer absorbent zone designed to handle a light-to-medium flow while you're in the water. Solid black matte performance fabric, flat seamless edges at the waist and legs, pull-on, no closures — so you can swim, sunbathe, and play in the waves without thinking about your cycle.

Swimwear That Works With Your Cycle

• 4-layer absorbent crotch zone — holds up to 2 tampons' worth of flow without leaking
• Mid-rise waistline with high-cut legs — classic bikini silhouette, no specialty-look
• Solid black matte performance fabric — smooth, stretchy, quick-drying swim material
• Flat seamless edges at waist and legs — no digging, no VPL under sheer cover-ups
• Pull-on construction — no ties, no hardware, easy on-off between swims
• Discreet under beach cover-ups — looks like standard athletic swimwear, not medical wear

Swim on Your Period, Stress-Free

Perfect for beach vacations during your period, postpartum ocean swims, hot yoga or pool days when flow timing is uncertain, surprise periods on the road, or any time you want backup protection without giving up swimming. The solid black and the standard cut keep it beach-discreet. Ideal when a regular swimsuit would mean sitting out, and a tampon isn't enough by itself.

Trusted by our period-care community for the leak-proof performance and the looks-like-regular-swimwear finish. Designed by moonful in collaboration with our intimates team and period-care specialists. Every layer, every seam, every edge has been refined through real customer feedback.

🛡️ 30-day hassle-free returns. Secure checkout. Quality guaranteed — if the absorbent layer loses its capacity or the fabric pills, we'll replace it. Order your usual bikini size; the 4-layer zone is built in.