At the trailhead before a morning run, the Drop Line 1/2-Zip Jacket takes the chill off and then breathes once the pace picks up. This half-zip fleece jacket uses 100% recycled polyester sweater fleece, a soft knit that lets heat escape as effort rises. The DriClime-lined collar wicks moisture at the neck, which keeps the zipped collar comfortable through a sweaty climb. What Our Gearhead(R) Experts Are Saying:"On ski days I wore it as a mid-layer, zipped up on the chairlift and opened at the chest on the way down, which kept me comfortable without swapping layers. Lunchtime runs worked the same way, because the open zipper vented heat early and the fleece held warmth at the crosswalk. It is not windproof, so on exposed ridgelines I wear it under a shell."