Cool gel keeps pets comfy * Puncture resistant material * Rolls up for easy storage * Size: X-Small: (12" L x 8" W x 0.5" H) Small: (16" L x 12" W x 0.5" H) Medium: (20" L x 16" W x 0.5" H) Large: (36" L x 20" W x 0.5" H) * B005JEMBMC