The Mountain Hardwear Warp Factor Insulated Jacket maps ThermoCloud insulation by zone, heavier through the body and hood and lighter at the sleeves, so the warmth stays low-bulk. Recycled nylon ripstop with waterproof DrySpell protection keeps storm days on the outside, and dropped pit placement leaves room to reach and turn. What Our Gearhead(R) Experts Are Saying:"On cold chairlift rides the jacket holds heat, and once laps pick up I unzip the underarm vents to dump it. The mesh backing keeps snow out while the heat leaves."