Big surprise, the Burton Arctic Jacket is INSULATED! Not that shocking, really. It is called the Arctic Jacket. What might be shocking, though, is that in addition to the lightweight level of low-bulk Thermacore(R) insulation, it's got a fleece blocked lining for a bit of added warmth in all the right places. The arctic isn't just cold and covered with penguins and seals and stuff, its windy, and wet. That's why the Arctic Jacket has been fully weatherized with our DRYRIDE Durashell(R) 2L fabric, fully taped seams, and the convenience of a removable waist gaiter with Link ZIP(R) jacket-to-pant connectivity.