Canada Goose "Expedition" extreme weather parka, originally developed for scientists working in McMurdo Station, Antarctica TEI 5 is optimal for temperatures -25°F and below; it is field-tested for the coldest places on earth. Adjustable down-filled hood Fleece-lined chin guard for added warmth and comfort Two-way zip closure with storm flap for an extra layer of protection Four double-entry pockets at front Interior drawcord at waist Recessed rib-knit cuffs add comfort and lock in heat "Expedition" webbing strap at back Fit Classic  Polyester/cotton Fill: Down Lining: Recycled polyester Dry clean only Made in Canada The Thermal Experience Index (TEI) is an easy-to-understand five point system that enables you to make an informed choice in your search to find the right parka, jacket, or knitwear for your specific environment and activity. It works using a scale, in which 1 indicates the lightest insulation--jackets, lightweight down for active pursuits--and 5 indicates the warmest parkas we make, the kind trusted in the world’s harshest conditions.