Thermal Experience Index (TEI)

Created with active pursuits and milder climates in mind, TEI 1 rated pieces offer our lightest level of warmth. Ideal for layering, TEI 1 pieces are lightweight, adaptable essentials that, depending on your location and season, work well as light outerwear on slightly chilly days or as versatile layers during active pursuits like hiking.

TEI 2 pieces are made with versatility in mind, offering core warmth and comfort across a wide range of conditions. They’re the jackets that keep you warm when winter temperatures dip below zero, but also are lightweight enough that you won’t overheat when it’s just above the freezing mark. They’re also ideal for layering and are designed to pair with a shell overtop for the ultimate in adaptable warmth. Wear them as a system with a waterproof jacket for active pursuits in colder weather.

This rating offers fundamental warmth, meaning TEI 3 jackets and parkas were designed to function as an everyday, go-to winter jacket. Durable, functional and warm, these jackets will quickly become your most reached for pieces when the cold--and snow and windchills--have set in for the season.

Inspired by the Arctic, but created with everyday wear in mind, TEI 4 parkas and jackets are designed for enduring daily warmth on colder winter days. With more insulation than our TEI 3 jackets, these parkas are ideal for anyone who spends time outside in the depths of the season or simply requires an extra boost of warmth for daily wear.

Designed to endure the harshest conditions on earth, TEI 5 jackets were created for ultimate warmth. Field-tested by people who work and live in the coldest places on our planet, these are our warmest jackets--and some of our most iconic styles.