Always a top seller, the Flip 35/50 Sleeping Bag from Mountain Hardwear allows you to stay warm at varying temperatures by simply flipping the bag over. With different amounts of Thermic MX synthetic insulation on either side, the Flip 35/50 will keep you comfortable at both 35 and 50 degrees. The semi-rectangular design provides tons of room so that you can spread your legs after a long day on the trail.