Soft, resilient memory foam cushion is pressure sensitive to help relieve stress points. Smart gel-cooling layer helps provides longer lasting cooling by dissipating heat. Long-lasting, fade-resistant fabric cover. Washable. Backrest?Two adjustable straps to keep your backrest in place at the optimal lumbar position. General Category: Seating Accessory; Sub-Category: Backrest; Temperature Control; Color(s): Black; Color Family: Black.