This incredible cocoon offers waterproof and breathable protection--it will provide you refuge even in the toughest conditions. DriZone laminated fabric protects you from mother nature's moisture, while allowing your own moisture to escape keeping you drier and warmer. All stitched seams are factory seam-sealed. Ample room for easy entry/exit with U-shaped zipper track. Snag-free zipper track prevents the dreaded stuck zipper by creating a barrier between the lining and the zipper track. Oversized foot box allows for a greater range of motion and extra space inside the sack.