I researched many different bags before buying this one. I needed a bag for winter/snow camping for the Central Oregon Cascades. This one met all the criteria in needed; down insulation for warmth and loft retention, draft collar, suprisingly ample room and ease of movement, and sufficent water reppeling ability. But as with any down bag, laying out in the rain or snow is not a good idea. Tent or Bivy is always recommended. Marmot hit a home run with this bag. For any winter camping, this will always accompany me. Loft retention is great, lots of room (especially in the foot box), all-around great bag for cold camping.