The All-in-One Fitted Sheet & Waterproof Cradle Cover from BreathableBaby provides a soft fabric top surface for infants to sleep comfortably while the waterproof backing helps protect the mattress from absorbing moisture and messes. Constructed to eliminate the need for a mattress pad and maintain the safety and integrity of the mattress. Helps block exhaled air from getting trapped between fabric layers to help prevent carbon dioxide rebreathing, a phenomenon suspected to be a contributor to accidental suffocation. Acts as a solid surface to eliminate the sandwich effect found in products, like padded bumpers (banned in the US in 2022)—creating a safer sleep space from birth to 12 months.