Smartwool Classic Merino Base Layer LS Men's Long Sleeve Crew Top

On a bitingly cold morning at the ski resort, you pull on the Smartwool Classic Merino Base Layer LS under your shell and feel immediate, natural warmth. This men's long sleeve crew top is the foundation of your cold-weather layering system, built from 100% ZQ-certified Merino wool for unmatched comfort and performance.

Key specifications

• Material: 100% ZQ-certified Merino Wool, 250 g/m² midweight interlock knit
• Fit: Slim fit for easy layering under midlayers and shells
• Neckline: Crew neck with flatlock seams to prevent chafing
• Sleeves: Long sleeves with shoulder panels that eliminate top shoulder seams for backpack comfort
• Properties: Breathable, moisture-wicking, odor-resistant, temperature-regulating, fast-drying, natural stretch
• Care: Machine wash cold, tumble dry low
• Season: Ideal for 3-season use, especially cold weather

Why choose it

Merino wool naturally regulates your body temperature, keeping you warm when it's cold and cool when you work up a sweat. The fabric wicks moisture away from your skin, dries quickly, and resists odors, so you stay fresh through multi-day adventures. The slim fit and flatlock seams ensure a smooth, non-bulky layer that moves with you.

Ideal use cases

• Skiing and snowboarding as a base layer under insulated gear
• Winter hiking and snowshoeing for breathable warmth
• Everyday cold-weather wear as a comfortable, odor-resistant top
• Travel and commuting in chilly climates

Good to know

ZQ certification guarantees ethical wool sourcing and environmental responsibility. The interlock knit provides durability and a soft hand feel, while the shoulder panel design reduces irritation when carrying a pack. This base layer is a versatile staple for any cold-weather wardrobe.