Smartwool Classic Thermal Merino 1/4 Zip Base Layer

Lightweight Thermal Regulation for Active Use

The Smartwool Classic Thermal Merino 1/4 Zip is a versatile cold-weather base layer designed for performance, comfort, and adaptability in alpine environments. Constructed from premium merino wool, it provides natural temperature regulation, moisture management, and odor resistance for consistent comfort in a wide range of conditions.

The 1/4 zip design allows for easy ventilation control, making it ideal for high-output activities such as skiing, snowboarding, hiking, and winter travel. The soft merino fabric delivers next-to-skin comfort while maintaining breathability and durability for repeated use.

This base layer functions as a foundational piece in any cold-weather layering system, offering balanced warmth and ventilation for both active and casual winter use.

Key Features 

• Premium merino wool thermal construction
• 1/4 zip for adjustable ventilation control
• Moisture-wicking temperature regulation
• Naturally odor resistant performance fabric
• Breathable insulation for active use
• Lightweight cold-weather layering design
• Ideal for skiing, snowboarding & hiking
• Soft next-to-skin comfort
• Easy layering under shells and jackets
• Durable technical outdoor fabric
• All-day winter performance comfort
• Versatile alpine base layer top