The Mambe Extreme Blanket is designed for colder conditions where maintaining body heat is essential. It is made with genuine Polartec® Classic 300 fleece and includes an innovative reflective lining that helps block the loss of radiant body heat. Consider it the integration of the original "space" emergency blanket technology and the comfort and durability of a Mambe blanket. You"ll be amazed at the performance of this innovative solution - only from Mambe Blanket Co. Warm fleece on one side and soft waterproof nylon on the other side. Available in two sizes: Small: 48" x 58" (approx. 4"x5"), Large: 58" x 84" (approx. 5"x7"). Stuff sack included for convenient storage and transport. Machine washable (cold water, low heat). Proudly made in the USA.