Chair pads feature 2.5"" thickened 30D high resilience foam, 1"" thicker than standard cushions with stronger resilience for lasting shape retention. Waterproof design allows easy wipe cleaning removable covers are machine washable. Made of 250g/m high-density textured yarn polyester fabric, breathable and skin-friendly with overlocked edges. Hidden zipper prevents furniture damage. Double non-slip design includes bottom non-slip dots and side straps with ties for secure attachment. Set of 4. Weight: 8.49 pounds.