The Tex Sport Suppressor 20 Mummy Sleeping Bag will keep you warm and comfortable down to 20F. Its filling is 60% polyester and 40% 1-hole hollow fiber. Together with the two layer construction this keeps you nicely warm without any cold spots. The outer is a durable diamond rip-stop polyester and the liner a comfortable 70D/190T polyester. The autolocking left side zipper won't open in your sleep. The sleeping bag also features a comfy wind baffle draw-string hood so you can snuggle up as it gets colder. The bag features and interior accessory pocket hooknloop closure to keep your personal items safe. It's a great sleeping bag for backpackers, travelers and festivals as well as wilderness explorers.