Water-Resistant The cushion is made of soft, breathable polyester fabrics and is coated with water resistant coating that makes it difficult for liquids to penetrate through it for a certain amount of time. Soft and Comfort The cushion provides you with a comfortable working and living environment and relieves the sore waist and numbness in the hips. Detachable Cushion Cover Spot clean the cushion with mild soap to keep the cushion looking new. The zipper on the cushion cover can be easily removed for a deeper clean. About Size The dimensional tolerance of these cushions is 0.4 inch. Please note that cushions will arrive in a compressed state. Please don’t worry if you find cushions are larger and thinner than described. Please allow a few days for the cushion to return to its original condition, and you will be able to use it normally. Unzip the cushion to use the blow dryer or flap could improve efficiency.