Outer Cover Material: 210T Nylon,Waterproof and Breathable Fabrics; Lining Material: 190 T Polyester Pongee; Fill-Material: 100% hollow Microfiber. GREAT FOR ALL SEASONS - Rated temperature 5(℃)--25(℃), which allows sleeper warm even at 40(℉). Comfort temperature is 17(℃)--24(℃). This is achieved through double-filled technology. Perfect for backpacking, camping and hiking even using at home. Certainly the best sleeping bag for adventures GET FANTASTIC FREEDOM WITH SPECIAL DESIGN - Measures 29.5 W x 86.6 H in Perfectly fits an average size adult, and tons of space for kids. Two-way zipper with “zipper guard” to prevent stuck hooks effectively. Separated zipper at the bottom can also make your feet often come out through the wind. Double zipper slider allow you to open the bottom of the sleeping bag at a warm night. You can even fully open the sleeping bag then use as a blanket.