Smartwool Men's Classic Thermal Merino250 Base Layer 1/4 Zip (Charcoal Heather)

This Smartwool Men's Classic Thermal Merino 250 ¼ Zip Base Layer features 100% ethically sourced Merino wool made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance. Smartwool's best-selling and warmest base layer of non-itching, easy-care Merino.

Check out this Smartwool Men’s Classic Thermal ¼ Zip Base Layer video to see how it fits

This shirt is possibly even more of a mid than base layer, that can handle real abuse. A 100% natural fibre ‘active’ base layer that helps to regulate your temperature, insulates even when wet, and wicks moisture from the skin. This base layer brings consistent comfort, as well as reliable warmth and durability, to winter hiking, running and skiing.

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
• 20cm centre front zip with semi-locking logo slider
• 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

This Merino wool base layer feels soft and gentle to your skin and doesn't cause itching. The natural (transpiration) odour resistance lets you wear this shirt for days without washing which makes this top ideal for high aerobic performance activities.

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 base layer for cold weather conditions.