This lightweight and highly-portable shelter holds in the heat . thanks to Eskimo insulated IQ fabric??35% warmer than a comparable non-insulated shelter. The Sierra Thermal framework is made of aluminum square tubing that snaps into place in seconds . creating a formidable barrier against the elements when paired with the durable insulated fabric. A gray interior allows you to see what you’re doing when fishing . and two swivel Versa seats provide all-day ergonomic comfort. The seats are mounted to the sled . but can be fully-removed via hitch pin . or flipped forward to allow easy sled access. The Sierra Thermal is truly the perfect flip shelter for chasing fish on a cold day with a buddy.