... to 10 hours,it is soft,comfortable,innoxious . the cooling pillow/mattress/cushion can keep temperature constant for 8 to 10 ... and contribute a good sleep.1,the cooling cushion /mattress/pillow is soft,comfortable,innoxious and scentle.2,internal material: phase ... material: PVC,TPU composite waterproof fabric 4,specification :cooling children pillow:30*15cm,20*35cmcooling mattress:45*90cm,90*90cm,90 ...