Men's Intraknit Thermal Merino Base Layer Bottom

Next-Gen 3D Knit Engineering. Targeted Warmth & Rapid Heat Dumping.

The Smartwool Men’s Intraknit Thermal Merino Base Layer Bottom represents the pinnacle of technical layering for high-output mountain athletes. Utilizing revolutionary 3D-knit technology, Smartwool seamlessly weaves Merino wool and synthetic performance yarns together to place insulation where you need warmth most while creating targeted mesh ventilation zones to dump excess body heat instantly when you're working hard.

• 3D-Knit Intraknit™ Technology: Seamlessly integrates insulation, articulation, and ventilation directly into the fabric without extra bulk or friction-causing seams.

• Body-Mapped Mesh Ventilation: Seamless mesh panels knit into high-heat sweat zones allow your body to rapidly dump heat and moisture during boot packs and aggressive charging.

• Merino/Poly Hybrid Blend: Combines 53% Merino wool for natural thermoregulation and odor defense with polyester and elastane for faster drying times, enhanced durability, and rapid recovery stretch.

• Targeted Thermal Structure: Thicker knit zones over key muscle groups and joints trap essential heat without restricting movement or bulk under shell pants.

• Seamless Articulation & Ribbed Knees: Ergonomically engineered movement zones wrap natural joint flex points to eliminate pulling, sagging, or binding while turning.

• Performance Slim Fit: Second-skin, athletic silhouette maximizes moisture transfer away from the skin and fits cleanly under snow pants or technical bibs.