Features Water Bag :with waterbed PVC vinyl (EN-71 , NON-TOXIC), cold-resistant , heat-resistant and prevent enlargement. Soft Foam Liner :integral edge-wrapped design , with high density and excellent elasticity foaming substance covered with 0.45mm waterbed PVC vinyl, for compress packing. Zipper Quilting Cover :with 100% high class cotton cloth casing for absorbing sweat and ventilation. quilting with solid and heavy cotton weighs 240g and 1.2cm foam, with high quality and elegance, ventilation and temperature retention.