What Our Gearhead(R) Experts Are Saying:"I wore the Tempo 1/2-Zip Top on an early trail run when the sun came out fast and stayed out. The thumbholes kept my hands covered on the climbs, and the half zip let me vent once I warmed up."A trail run that starts cool and heats up by the second climb needs a layer that adjusts without a change of clothes, and the Tempo 1/2-Zip Top handles that shift on its own. The half zip front vents easily once the pace picks up, while SPF 30 protection covers the arms through exposed stretches of trail. Thumbholes keep sleeves in place over the hands on cooler descents, and the curved hem stays put without riding up. The fitted, moves-with-you cut means nothing shifts, whether the trail climbs, flattens, or drops.