The Smartwool Smartloft Vest puts a wind-resistant, non-PFC DWR panel across the front, so the one part of a vest most exposed to a headwind actually holds up to it. Underneath, 60 grams of recycled wool insulation does the warming, a genuine alternative to standard down or synthetic fill. Four-way stretch panels at the shoulders and sides keep the whole vest moving instead of binding, and a merino-blend lining adds a layer of softness against the skin. What Our Gearhead(R) Experts Are Saying:"I layer this under a shell on cold mornings and never feel it fighting my shoulders when I reach overhead. The core stays warm the whole time, arms included, without the vest ever feeling stiff."