Perfectly combining warmth and breath ability, SmartWool Women's NTS Midweight Zip Tee works in harmony with your body's natural heating and cooling systems to create a comfortable microclimate next to your skin. A superior insulator, SmartWool NTS Midweight is an ideal baselayer choice blustery cold Winter days, when the temps drop well into the single digits, or as a stand-alone piece for cool weather training. The active body-skimming fit is slightly more fitted for a flattering silhouette. Refined finishes include zipper garages, taller hems and cuffs, and contrast stitching. SmartWool Midweight tops have seam-free shoulders, prefect for those days when you have to carry a pack. Since it's 100% SmartWool interlock knit, you're assured it's totally itch-free, offers the ultimate in breathability and odor protection and it's totally machine washable and dryable.