Swim worry-free! Our Black Period Swim Bottom features our built-in absorbent liner and leak-proof technology, so you can swim, paddleboard, surf or just lounge on the sand all day. Our period swim bottom is designed specifically for water activity. No swelling in water! How does the leak-proof swimwear work? Leak-proof swimwear and materials was made specifically for water activity. It features a built-in absorbent liner and proprietary technology that's angled perfectly to collect your flow immediately onset before it travels. It can be worn with or without protection, depending on your flow - flow is very unexpected, so we do suggest to maintain your flow as normal. It can be used along with pads, tampons, or cups. If using with a pad, the pad will be discreet and secured perfectly in place underneath to collect additional flow and it will remain correctly intact. The swimwear's fabrics are fully functional and discreet, and it was made to be worn all day during wate activities.