evo.com | Smartwool Long Underwear Tops > If you take your base layer game seriously (and you should), the Smartwool Intraknit Thermal Merino Base Layer Crew Top is the holographic legendary version. Merino wool woven with polyester and elastane for improved durability, stretch and articulation will make it hard to go back to anything else. 3D Mapping Results In Near Custom Fit and Freedom of Movement Slim Fit Mesh Ventilation Seamlessly Knit In Gender-Specific Zones Designed to Keep the Body Dry and Comfortable 53% Merino Wool / 45% Polyester / 2% Elastane Engineered Construction Uses Knit Structures to Enhance Performance with Lighter Weights and Cleaner Finish | Smartwool Intraknit Thermal Thermal Base Layer Crew Top Men's 2026 - Large Blue | Wool/Elastane/Polyester