What Our Gearhead(R) Experts Are Saying:"I put the Atlas Infinity H2Flow Shell through a full week of high-output skiing in variable conditions, and it managed my body temperature better than any shell I've worn. The H2FLOW system is doing something genuinely different from a standard vent zip, moving heat out of the jacket actively rather than waiting for you to stop and manually open something up."The longest, hardest ski days are the ones that demand the most from your gear, and the Atlas Infinity H2Flow Shell from Helly Hansen was built specifically for those days. At the core of what makes this shell different is the H2FLOW(TM) Air Force Ventilation system, a first-of-its-kind technology that uses strategically placed down and PrimaLoft(R) Gold Cross pods to actively circulate and release heat rather than waiting for you to stop and crack a vent zip. The result is a jacket that manages your temperature continuously through the high-output climbs and cold, exposed descents that define a real day in the mountains. HELLY TECH(R) Professional waterproof and breathable technology pairs with LIFA INFINITY(TM) and fully sealed seams to handle whatever the weather brings, while raglan sleeves, no shoulder seams, and articulated construction keep the jacket from fighting you through aggressive turn sequences. A detachable helmet-compatible hood, removable stretch powder skirt, RECCO(R) reflector, and LIFE POCKET(TM) round out a shell that has accounted for every hour of a serious ski day.