Knix for teen black high waist bathing suit bottoms. Size small EUC From knix Period? No problem. These bottoms let you swim with confidence, not discomfort. You can wear them alone or as backup protection to tampons and menstrual cups. Designed with three layers of leakproof technology: Layer 1: A silky-smooth top layer that sits comfortably against the skin. Layer 2: A highly-absorbent middle layer designed with our leakproof technology to absorb about the same as 1-3 regular tampons of period blood. Layer 3: A waterproof outer layer prevents swelling.