Foam base mattress is covered in a quilted vinyl,to fit the bottom of the cradle.Made of premium polyurethane foam base for support and stability. Waterproof and safe- no toxic phthalates or lead. Meets consumer product safety standards.Wipes clean easily with a damp cloth. Hypo-allergenic-resists dust mites,allergens and bacteria. Meets mattress flammability standards. Made in USA. Size is 15-1/4" x 30" x 2" to fit cradle plan # 362.