Based on cold chamber lab research and extensively athlete-tested, this jacket has been engineered with body-mapped fabric and insulation technologies from GORE-TEX INFINIUM, PERTEX AIR and POLARTEC ALPHA DIRECT to balance protection from the elements with efficient heat and moisture management, keeping you comfortable when working hard in the elements.30 Denier GORE-TEX INFINIUM nylon in the core body and over arms30 Denier PERTEX QUANTUM AIR nylon across the back and under the arms120g/m2 POLARTEC ALPHA hi-loft insulation across the back, under the arms and in the hood90g (M) of 90/10 water resistant fluorocarbon-free HyperDRY goose down at 800+ fillMicro chamber construction in the core bodyFully adjustable roll-away insulated climbing helmet compatible hood with stiffened peakFull-length two-way YKK VISLON front zip with internal storm flapTwo zipped hand pocketsConcealed zipped chest pocketPre-elasticated cuffsAdjustable hem with cinchable drawcord