The Icebreaker Women's Helix Jacket delivers heavenly warmth throughout winter, whether you're at the resort or downtown. MerinoLoft insulation makes this jacket Icebreaker's warmest midlayer. It stays warm when wet, which would be hard to do because the recycled polyester shell has a water resistant treatment to shed snowflakes. Icebreaker added merino wool, Lycra blended side panels for stretchy mobility and extra comfort. This slim fitting jacket slides under hardshells with ease, and thumbholes secure the sleeves so they don't creep up your arms.