Sofa Support Foam size-20-x-20 since the chair mat is

since the chair mat is so thick

INDOOR AND OUTDOOR USE: A great option for both indoors or out

liners can also be cut to custom sizes with a household scissor

it will snap back together in seconds

also provides a sturdy surface for coloring

Sofa Support Foam size-20-x-20 since the chair mat isSTRONG HOLD GRIP DOTS: hundreds of silicone grip dots on top and bottom help keep sofa support foam in place on couch frame and under cushions; helps cushions remain steady and aligned, reducing sliding, bunching and constant readjusting; underside dots hold foam to the sofa base UNIQUE ERGONOMIC SHAPE: innovative curved design fits naturally against couch frame; promotes balanced, even cushion support; helps provide greater support to the deepest