100% Cotton, lined with PUL. Very soft, does not attract heat. Standard Size: Fits Standard foam pads for Bilia, Nap & Pack, Changing Baskets, Malaika, and Ark Bassinets. It works for foam pads on Signature Bassinets & Changing Baskets, Ark Bassinet, and Malaika Bassinet. This sheet does not work with the Adjoa, Afia, or Frema Changing basket.  Must be air dried.  For the safety of all our tiny customers, we do not accept returns of opened cloth products. Must be washed cold and dried without heat.