Steady laps on a cold ski trail build heat fast, and the waffle-backed interior of the Swix Tista Grid 1/2-Zip Midlayer traps it close to the body. The recycled grid fleece is brushed on one side and anti-pilling on the other, so this half-zip pullover has a soft inside and a surface that resists fuzzing. What Our Gearhead(R) Experts Are Saying:"On long winter hike climbs, I unzipped the half-zip once the pace picked up, and the extra heat let out in seconds. Zipping it back up on the descent brought the warmth straight back."