The Sleeping Bag & Mat Plus is a hybrid sleeping bag with an attached sleep mat and retains warmth in temperatures as low as 37.4F. Use the sleeping bag for your outdoor excursions from Spring to Fall. The sleeping bag features a modular dual zipper to separate the top and bottom of the sleeping bag. internal pocket. and attached mat. Pair the Sleeping Bag & Mat Plus with the Stretch Pillow for a full sleeping set-up.