Classic Thermal Merino Base Layer 1/4 Zip - Men's (Spring 2024)

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Warm, soft merino base layer for any cold-weather activity

Smartwool has updated the fit of their men's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of their heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more.


Formerly known as the Merino 250 Base Layer 1/4 Zip. Packaging may have either name but the product is identical.


Brand Name:
Weight of Baselayer:
Mid Weight
298 g / 10.51 oz
Shirt Type:
Zip Top - Long Sleeve
Mfg Sku/Part Number:
Other Features:
• 100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance
• Fit updated to improve functionality while enhancing aesthetics
• Shoulder panels eliminate top shoulder seams
• Flatlock seam construction designed to minimize chafing
• 10in. (25 cm) center front zipper semi-locking slider
• Slim Fit

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