The technical and versatile Thermarest Proton Blanket is a security blanket for high adventure, offering the latitude to go from an adventurous, fair weather bivy blanket, to a deluxe campfire companion. The Proton will keep you charged for adventure knowing you'll be warm and protected with its waterproof, breathable shell, eraLoft synthetic insulation and reflective ThermaCapture Technology designed to provide you with reliable warmth and comfort in a broad range of conditions. Waterproofbreathable shell fabric sheds moisture for added protection and utility 1000mm Hydrostatic Head 5000 Moisture Vapor Transfer Rate. Hollow microfiber polyester eraLoft insulation. Reflective ThermaCapture coating inside maintain warmth and loft even when wet. Tapered, weight reducing shape packs into its own pocket. Drawcord at bottom edge reduces drafts and cinches around a mattress to keep the blanket in place. Perimeter snap loops mate with another Therm a Rest quilt, blanket, sheet or Mattress Snap Kit. Import.