Classic Thermal Merino Base Layer 3/4 Bottom

Pure 100% Merino Warmth. Zero Boot Interference.

The Smartwool Men’s Classic Thermal Merino Base Layer 3/4 Bottom (formerly Merino 250) is the ultimate midweight thermal layer built specifically for skiers and snowboarders. Crafted from 100% responsibly sourced Merino wool, this 3/4-length bottom sits comfortably just above your boot cuffs—eliminating bunching, hot spots, and painful pressure points inside your ski or snowboard boots while delivering premium warmth and breathability.

• 100% Merino Wool Construction: Heavyweight 250g interlocking knit fabric provides exceptional warmth, natural thermoregulation, and built-in odor resistance for multi-day trips.

• Boot-Friendly 3/4 Length: Cut to rest cleanly at the mid-calf, preventing fabric overlap and bulk inside tight ski boots, snowboard boots, or mountaineering footwear.

• Chafe-Free Flatlock Seams: Flatlock seam construction minimizes friction and prevents chafing during high-output touring, hiking, or charging on-piste.

• Merino-Lined Elastic Waistband: Soft Merino wool fabric sits directly against the skin around the waistband for maximum comfort and moisture management.

• Functional Fly: Traditional working fly design offers practical convenience on the mountain.

• Slim/Active Fit: Contoured fit hugs the body to maximize thermal efficiency and fit seamlessly under technical shell pants or bibs.