Smartwool Classic All-Season 3/4 Merino Bottom Base Layer - Men's Black Extra Large. With responsibly sourced Merino wool lining its wide elastic waistband this bottom will provide uninterrupted softness next to your skin. Specifications for Smartwool Classic All-Season 3/4 Merino Bottom Base Layer - Men's: Manufacturer: Smartwool Gender: Male Age Group: Adults Application: Outdoor Color: Black Fabric/Material: Recycled Nylon Merino Wool Features of Smartwool Classic All-Season 3/4 Merino Bottom Base Layer - Men's Our lightweight Merino jersey fabric uses a recycled nylon core while still keeping 100percent Merino wool next to skin Package Contents: Smartwool Classic All-Season 3/4 Merino Bottom Base Layer - Men's Smartwool SW01696000110XL000: Classic All-Season 3/4 Merino Bottom Base Layer - Men's Black Extra Large