We have received a lot of requests for a lined winter pant over the past few years, but we wanted to make something that was lightweight, durable and warm. Not an easy combination. We started with a proven softshell fabric that features a 10k/10k waterproof breathable PU membrane bonded to a warm lightweight fleece lining for maximum cold weather protection and comfort. The front of this pant is reinforced with 500D Cordura® Nylon and features full YKK zippered back pockets and. This pant took over two years of development and testing to get it just right and features the same quality and durability and american manufacturing that 1620 is known for. Guaranteed for life, this is the ultimate cold weather pant for heavy use environments and recommended to be worn in temps below 32 degrees.