Reinforce your cold weather defenses with this USMC ECW Bag. This oversized Outer Bag is intended to add extra warmth to your existing sleep system. When added over the typical U.S. Military inner bag, the combination provides dependable sleeping comfort at temperatures as low as -20AdegF. Used alone, this Bag provides comfort down to 5AdegF (when combined with suitable cold-weather sleep wear). Cinch-down hood keeps heat from escaping out the top, or adds pillow-like comfort in warmer temps. Unlike most versions we've seen, this Bag's been upgraded with a 100% waterproof SealLine compression sack. Keeps the bag dry, and also helps protect against damage during transport. Upgraded with USMC issue Waterproof SealLine Compression Sack USMC ECW 4 Season Sleeping Bag (Outer Bag) Comfort rated to +20AdegF (alone) Heavyweight self-healing zipper Cinch at head opening for added coverage Accommodates users up to 6' 5''