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For those that run a little hot, lightweight SmartWool is the ideal fabric that combines versatility with four-season function. This highly breathable jersey-knit top is designed for athletic people on the go. This piece works great as a next-to-skin layer in colder weather, or as a primary layer in warmer weather. The Smartwool fiber moves moisture away from the skin in its vapor state, so no more getting cold when taking a break due to wet, clammy skin.