Smartwool Men's Classic Thermal Merino Base Layer Crew (Twilight Blue Heather)

Smartwool's Men’s Classic Thermal Merino Base Layer Crew is a must-have for winter adventurers offering a perfect balance of warmth and breathability. A shirt made of 100% ethically sourced Merino wool with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance. Designed for high-intensity activities in cold conditions such as skiing, running or hiking.

Check out this Classic Thermal Merino Base Layer Crew video to see how it fits

This shirt is possibly even more of a mid than base layer, that can handle real abuse. What sets this base layer apart is its construction: made from 100% responsibly sourced Merino wool, it boasts a 250-g/m² interlock knit that delivers substantial insulation. The updated design improves both fit and functionality, with shoulder panels that eliminate seam irritation and flatlock seams to prevent chafing during movement. This thoughtful design allows you to focus on your activity without distraction.

Merino wool’s unique properties make this base layer exceptional. Merino naturally regulates temperature, wicks moisture, and resists odors, keeping you warm even when wet while maintaining freshness all day. Known for its softness and durability, Merino wool is gentle on the skin and doesn’t itch like traditional wool, offering a cozy, low-maintenance choice for any cold-weather gear collection

For more info on the Classic Thermal base layers, watch this Smartwool | Men's Merino 250 -video

• Made of 100% ZQ-certified Merino Wool
• Durable, warm, insulates even when wet, transpiration odour-resistant, breathable, wicking
• Crew neck
• Back body seam wraps to front for body-enhancing fit
• Shoulder panels eliminate top shoulder seams
• Flatlock seam construction eliminates chafing
• Heat transfer logo at left sleeve cuff
• Excellent UPF protection: UPF 50+
• Slim, snug fit; follows body contours

Smartwool's 250 g/m² midweight shirts for next-to-skin comfort are best used as a single layer for mild weather performance or as a baselayer for cold weather conditions.