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The Smartwool Classic Thermal Merino Base 1/4 Zip is a versatile cold-weather layer designed to deliver dependable warmth, breathability, and moisture control in active and everyday winter conditions. Constructed from 100% merino wool with a thermal knit, it provides enhanced insulation while maintaining natural temperature regulation.
Perfect for skiing, hiking, or daily cold-weather wear, this base layer adapts to changing activity levels with ease. The quarter-zip design allows for quick ventilation, while the snug fit makes it ideal for layering under technical outerwear or wearing on its own in milder conditions.
✔ 100% merino wool thermal knit delivers natural warmth
✔ Moisture-wicking and odor-resistant for extended freshness
✔ Quarter-zip design provides adjustable ventilation
✔ Flatlock seams reduce chafing during movement
✔ Snug, flexible fit ideal for layering systems
✔ Breathable construction supports all-day comfort
✔ Durable design built for repeated cold-weather use
Product Type: Base Layer 1/4 Zip
Material: 100% Merino Wool (Thermal Knit)
Fit: Snug / Performance Fit
Closure: Quarter-Zip Front
Use: Skiing / Hiking / Winter Layering / Cold Weather Activity
