Product introduction 1.This cool cushion/mattress uses high-tech patented phase change energy storage materials as filling material, 2environmental PVC compound fabrics as packing. 3 it does not contain preservatives, each process have been inspected strictly. Composition: internal material: phase change energy storage materialexternal material: PVC,TPU composite waterproof fabric.size:90*140cmweight:5.4kgNow there are some sets of cooling matress with two free cooling pillows. These products attach Japanese brand with good quality and cheap price.BUt the quantity is limited ,Pls take this chance!