evo.com | Smartwool Long Underwear Tops > Put on the Smartwool Classic Thermal Merino Base Layer Crew Top and enter a world of comfortable natural fiber. A slim, efficient fit keeps warmth next to the body while the odor-resistant construction also breathes for better thermoregulation. Flatlock seam construction minimizes chafing so you can be confident using this base layer through your high-exertion athletic pursuits. Fit Updated to Improve Functionality for a Wide Range of Body Shapes Flatlock Seam Construction Designed to Eliminate Chafing Slim Fit 100% Merino Wool Made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance. Back Body Seam Wraps to Front of Body Enhancing Fit | Women's Smartwool Classic Thermal Base Layer Crew Top 2026 - X-Small Blue