It makes it easy to swap in a fresh sheet for when surprise accidents occur. Features an envelope design that slips over the entire BassiNest pad for safe sleep. Fits the Swivel, Flex or Glide Sleeper's unique hourglass-shaped HALO pad. 30" x 16" 100% pre-shrunk cotton. Machine washable. Not compatible with any other brand of bassinet. The HALO BassiNest fitted sheet is designed for the HALO BassiNest