Nautica Cotton Terry Waterproof Spa Mattress PadCal King cotton Size: Cal King - Color: White Nautica Cotton Terry Waterproof Spa Mattress Pad with a polyester back with a soft laminate. Protect your bed and have peace of mind. This waterproof cotton mattress pad repels liquids and is backed by a soft laminate that acts as an additional barrier. It easily goes on your mattress like a fitted sheet. The skit fits mattresses up to 20" deep. Cal-King Size. Material Content: Cotton Terry Polyester Pack and Fill Soft Laminate