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The Mountain Hardwear Glacial Trail 1/2-Zip Top masterfully fills the role of a bombproof mid-layer in our closet and somehow manages to also be featherlight. The Singtex fabric is designed to move with us whether we're sending our latest project at the crag, logging miles on the trail, or bagging peaks in the high alpine. The highly durable construction breathes well and wicks moisture away from our skin, and on especially grueling climbs we can let the half-zip down to circulate more air. The slim profile ensures that we don't have to deal with bulky layers, and the thumbholes lock our sleeves in place no matter how hard we're working.