The Womens 3-Season Yachiyo 15 Degree Sleeping Bag returns from Sierra Designs 2006 line up, but with a new shell color and pattern for the lining. SD still uses reliable, long-lasting Climashield XP insulation. It warms down to 15 degrees and retains its insulation value when wet. Sierra Designs tricot lined the ergonomically shaped foot box, giving it more warmth. Pad Locks, Snag Free Zipper Tracks, and a pillow pocket help give you the most comfortable nights rest possible.