The Helly Hansen Alpha Insulated Pants pair a 3-layer Helly Tech Professional shell with a light 40g fill of PrimaLoft Black Eco, striking a lighter balance than a heavier insulated pant without giving up waterproof protection. Four-way stretch fabric and articulated knees keep the fit moving through wide turns and deep knee bends. Snow gaiters and an adjustable waist round out a fit built to stay put through a full day on the hill. What Our Gearhead(R) Experts Are Saying:"These barely register once I've got them on. I skip the extra baselayer most days now because the shell blocks the wind and the fill is just enough to keep me from noticing the cold at the chair."