Abripedic 2.5" Thick Gel Memory Foam California-King Mattress Topper 3-Year Warranty by Royal Hotel Luxury 2.5" Thick 100% premium Gel memory foam mattress topper ventilated for air flow Abripedic memory foam formula offers superior comfort and pressure relief Viscoelastic memory foam naturally anti-microbial and resistant to allergens, mold, bacteria and dust mites The soft consistency quickly conforms to weight and pressure 3 Pounds Density, 3-Year warranty