A superior insulator, the SmartWool Men's NTS Midweight Merino Wool Zip T is an ideal baselayer choice for blustery cold winter days, when the temps drop well into the single digits, or as a stand alone piece for cool weather training. Now refined with an improved fit, chafe free seam construction and panels that offer more comfort with a pack, NTS Midweight is SmartWool's best selling, warmest baselayer. Since it's 100% SmartWool interlock knit, you can rest assured it's totally itch free, offers the ultimate in breathability, odor protection and it's totally machine washable and dryable. Constructed of 100% merino wool fabric. Interlock knit UPF 50. 10 inch center front zip with semi locking logo slider. Shoulder panels eliminate top shoulder seams. Flatlock seam construction eliminates chafing. Heat transfer logo at left sleeve cuff. Form fit. Avg. weight: 10.05 oz. Import.