All in one: Waterproof Bassinet Sheet and Mattress Pad Cover Our Waterproof Bassinet sheet is lined throughout with Eco-friendly TPU especially designed with no seams to prevent leakage, so no mattress pad cover, mattress liner or mattress protector is necessary. Clean up is a breeze and your Bassinet Sheet and your mattress is fully protected. Soft and Breathy: 100% Jersey Cotton Our Bassinet Sheet Sets are composed of light, soft and breathable fabric. Made from 100% high quality Jersey knit cotton, babies love our Bassinet sheets, as they offer a soft, welcoming texture that lulls them into restful sleep.