Mountain equipment classic 300 sleeping bag skydiver left zip the lightest of the classic collection a spacious and comfortable bag for spring and summer use features helium tm 40 outer shell is lightweight and breathable 263g of 90 10 pure duck down with a minimum fill power of 700 mountain fit is both spacious and thermally efficient slanted box wall baffles throughout mid level side seams 5 baffle anatomically shaped hood 2 baffle anatomically shaped and offset foot box full l