Go farther, work harder and stay cool with Smartwool's Active Ultralite Long Sleeve Top for men. Made for high-output days when breathable comfort matters most, this top is made with a lightweight blend of Merino wool and TENCEL Lyocell that helps regulate temperature, manage moisture, and resist odors. The athletic fit moves with your body, while offset shoulder and side seams help reduce chafing over long miles. Reflective details add visibility in low-light conditions, making this versatile top a great choice for trail running, hiking, cycling, training, and layering on cool-weather adventures. Wear it solo when temperatures rise or as a lightweight base layer when the air turns crisp.
Natural temperature regulation, moisture management, and odor resistance for active days
Athletic fit that follows the body for unrestricted movement
Offset shoulder and side seams to help minimize chafing during extended activity
Reflective details for added visibility in low-light conditions
Winter 2026/27 product
Smartwool Active Ultralite Long Sleeve Top - Men's
