The Colgate Wee-A-Way portable crib flat waterproof mattress pad cover fits the most popular size portable crib mattresses - 24" X 38.5". The cover is ultra soft after the first washing and will hold up to repeated washing and drying with minimal shrinkage. The waterproofing layer is on the back side of the cover thus keeping cloth closest to baby"s skin while keeping any liquids from reaching the surface of the mattress. Parents can have confidence in this product because the Colgate Wee-A-Way mattress pad cover is made by Colgate, The Crib Mattress Specialist, a family owned and operated company with over half a century of crib mattress manufacturing experience. All Colgate crib mattresses, pads, and accessories are quality made, are non-toxic, pass all government safety standards for chemicals and flammability, and are manufactured in Atlanta, Georgia, USA.