The Odin Stretch Hood Insulated Jacket pairs PrimaLoft(R) Gold Active+ insulation with a recycled nylon stretch ripstop shell, so it holds warmth without trapping heat during real exertion. Articulated elbows and raglan sleeves keep the fit moving with us on a scramble or a skin track. It layers under a shell for backcountry skiing and mountaineering, or stands alone on a brisk hike. What Our Gearhead(R) Experts Are Saying:"I've skinned uphill in this and never had to stop to vent. The PrimaLoft breathes through the climb instead of building up heat, so I only add a shell once I'm standing still."