Designed with couples in mind, the North Face Twin Peaks BX ($160) keeps two campers warm and comfy in temperatures down to 20°F. The Twin Peaks BX features H.O.T. SL synthetic insulation, an insulated tricot thermal gasket and a silky polyester tricot lining for a comfortable night's sleep. With overlapping shingle construction and two full-length zippers, the Twin Peaks BX lets each person customize their sleeping temperature as they see fit.