The first layer is the most important in a winter wardrobe, start yours off with the Minus 33 Mid-Weight Bottom for the ultimate in warmth. Made with 100% 18.5 Micron Merino Wool, this mid-weight bottom is ideal for fall and winter seasons. The 230 g/m2 Interlock knit construction is a comfortable way to keep out the cold and lock in the warmth. Flat lock seams prevent chafing, making this thermal bottom easy to wear all day long. With Minus 33 laundry is simple because both tops and bottoms are machine washable and machine dryable.