Smartwool's warmest base layer, the Merino 250 offers all the benefits of no-stink Merino like natural temperature regulation and moisture management. The boot top length delivers a perfect fit with performance boots.Features:Slim fit, mid rise100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance Merino-covered elastic waistband and traditional fly designFlatlock seam construction designed to minimize chafingSize M - Inseam 20.5"Constructed of 100% Merino wool