Smartwool Men&';s Classic All-Season Merino Base Layer Crew The Smartwool Men&';s Classic All-Season Merino Base Layer Crew is a lightweight, versatile layer built for everything from spring snowboarding to summer camping. Its 150 g/m^2 Merino jersey fabric uses a recycled nylon core for added durability while keeping soft Merino wool next to the skin. Merino wool naturally helps manage moisture, regulate temperature, and resist odors across changing conditions. A slim fit combines with flatlock seams and strategically offset seams to provide comfortable, low-bulk layering throughout the year. Details Material: 88% Merino wool, 12% recycled nylon Fabric Weight: Lightweight 150 g/m^2 Merino jersey Fit: Slim fit designed to follow the contours of the body Construction: Recycled nylon core for durability with 100% Merino wool next to skin Performance: Merino wool naturally helps manage moisture, regulate temperature, and resist odors Seams: Flatlock construction with offset shoulder and side seams helps minimize chafing Features: Side seams wrap toward the front for added comfort Made In: Vietnam