Smartwool Apparel Size Guide When the mercury dips, it's easy to get buried under the bulk of old-school cold-weather gear. Free yourself from the burden and shed those layers for the naturally breathable, moisture-wicking, and warm performance of a Smartwool NTS Mid 250 Bottom. Form fit has a modern cut that follows the contours of the body. NTS Mid 250 fabric is made up of a single layer and a baselayer for cold-weather protection. Interlock knit. Flatlock seam construction is designed to help eliminate chafing. Wide self fabric covered elastic waistband for comfort and a flattering fit. Heat transfer logo at left hip. 100% merino wool. Machine wash warm, tumble dry low. Imported. Measurements: Waist Measurement: 24 in Outseam: 40 in Inseam: 30 in Front Rise: 9 in Back Rise: 13 in Leg Opening: 6 in Product measurements were taken using size SM, inseam 30. Please note that measurements may vary by size.