This U.S. Military Cold Weather Sleeping Bag is the inner bag component of the legendary MSS (Modular Sleep System). More specifically, the updated post-2007 improved version. Completely usable on its own for comfort in temps down to -10AdegF. Combine with the original issued patrol bag (not included here) and stay cozy down to an astounding -30AdegF. Because this is the "improved" version, this Bag is even lighter than the original, weighing in at only 4 lbs. Improved Intermediate Cold Weather Sleeping Bag Component of IMSS (Improved Modular Sleep System) Comfort rated down to -10AdegF Water-resistant ripstop nylon Sewn-in insulation prevents migration Adjustable hood with drawcord and barrel lock for heat retention Quilted chest collar stops air drafts Anatomically designed foot box with twice the insulation of the bagNote: May have DRMO ink stamp, please see Additional Product Information on how to remove