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From mild to cold temperatures, the Smartwool Active Uptempo 1/4-Zip Top is a staple in our gear closet. Featuring a blend of Merino wool and recycled polyester, the Active Uptempo 1/4-Zip Top is perfect for wearing on its own in mild conditions or layered under a mid-layer when it's colder out. The thumbholes help to keep the sleeves in place, and the reflective accents help to keep us seen in darker conditions.