Smartwool Men's Classic Thermal 250g Merino Baselayer Bottom Black Size:XL Zipped side entry for easy

Zipped side entry for easy bathroom access

The two-layer fabric is soft-to-the-touch

The fabric balances warmth and breathability for consistent comfort through cold starts and high-output laps

FLAD = Forward Lean Adjustment

Lining: Recycled polyester and nylon used for linings

Smartwool Men's Classic Thermal 250g Merino Baselayer Bottom Black Size:XL Zipped side entry for easyWarmest weight 100% Merino wool delivers consistent insulation with natural moisture management, temperature regulation, and odor resistance, all built into a smooth interlock knit that stays comfortable during high output days. Flatlock seams reduce friction, while a Merino lined elastic waistband maintains soft, secure comfort under packs and shells. Cut with a slim, body hugging fit, the Smartwool Mens Classic Thermal 250g Merino Baselayer Bottom