Crib Accessories Amazon.com : Babyletto Pure Core 4" Midi Crib Mattress, Hybrid Amazon.com : Babyletto Pure Core Crib Mattress, Dry Waterproof Cover, 2 Babyletto Pure Core Crib Mattress w Hybrid Quilted Waterproof Cover Introducing Babyletto Baby Bedding! Project Nursery. Replacement cover. All Pure Mattress bundles come with an original cover. Waterproof cover made of non crinkly fabric Sized for full size crib mattresses This is a replacement cover for the mattress cover included with: Pure Core with Dry Cover mattress bundle (M5322BB) Coco Core with Dry Cover mattress bundle (M5326BB) Materials: Face: 100% Polyester (PET); Back: 100% Food Grade Polyethylene; Band: Elastic Country of origin: Taiwan (R. O. C.)