Create the ultimate sleep system for two. This brushed polyester sheet provides next to skin comfort while joining two mattresses. It includes two sleeves that can accommodate two large (25 x 77 in or 63 x 19 cm) rectangular mats up to 4 inches (10 cm) thick. Equipped with integrated perimeter loops, the Synergy Coupler also mates with our blankets and quilts, so you can create a luxurious double bed in the backcountry.