We built the Pines Microgrid Ultra-Lt Baselayer 1/2-Zip Top for the days we're skinning up, shredding down, and moving nonstop between the two. The ultralight microgrid fabric sheds heat while we work, then holds warmth the second we stop to strip skins or take in the view. Wicking properties clear moisture off the skin so there's no clammy chill waiting for us at the pause. A next-to-body fit and updated raglan sleeves keep every reach and stride comfortable underneath it all. What Our Gearhead(R) Experts Are Saying:"I run cold at the top of every climb and hot the second I start moving, so this is the one baselayer where the zip actually earns its spot. Drop it before the pitch steepens, zip it the moment we crest into the wind."