These lined cargo pants provide up to four hours of continuous warmth using safe, low-power far infrared energy transmitted through the lightweight, flexible carbon fiber mesh sewn into the fabric. Made of a 65% cotton/35% polyester blend shell with a 100% polyester fleece lining, the pants heating elements are located in the front thighs and waist, yet envelop the entire lower body in radiant heat. The compact and unobtrusive rechargeable lithium-ion battery (located in the thigh) requires a five-hour charge using the included AC adapter. Machine washable. Specify unisex sizes S (28-30), M (31-33), L (33-34), or XL (34-36). Imported. (3 lbs.)