Designed to be worn for cold weather aerobic activities, this is one of the hardest working baselayer tops, offering the unique combination of merino breathability with a windproof 1CFM rating. Also constructed with jersey and rib knit with a wind resistant front panel for increased protection, this baselayer style features a 13" center front zipper, sculpted side panels that eliminate side seams for reduced chafing and body enhancing fit and contoured sleeve cuff and drop tail bottom hem for increased coverage.