North American Rescue HPMK Hypothermia Prevention and Management KitPatented Hypothermia Prevention & Management Kit (HPMK) with reinforced Heat Reflective Shell (HRS) is strong, flexible, lightweight and impervious to wind and rain. Mfg# 80 0027 Product Specs Includes 1 Heat Reflective Shell (HRS) with built in hood Self heating shell liner Self heating liner provides temperatures to 106 degrees and sustains 6 hours of continuous dry heat Vacuum packaged in a durable pouch Dimensions: Packaged 6 3 4"H x 10 1 2"W x 5