Smartwool Women's Classic Thermal Merino Base Layer 1/4 Zip (Charcoal Heather)

Smartwool's Women’s Classic Thermal Merino Base Layer ¼ Zip is a must-have for winter adventurers who crave warmth, comfort, and functionality. Designed for high-intensity activities in cold conditions, this top is ideal for everything from skiing and snowshoeing to running and hiking, offering a perfect balance of warmth and breathability.

Check out this Women’s Classic Thermal Merino Base Layer ¼ Zip video to get a sense of its fit and style.

What sets this base layer apart is its construction: made from 100% responsibly sourced Merino wool, it boasts a 250-gsm interlock knit that delivers substantial insulation. The updated design improves both fit and functionality, with shoulder panels that eliminate seam irritation and flatlock seams to prevent chafing during movement. This thoughtful design allows you to focus on your activity without distraction.

Merino wool’s unique properties make this base layer exceptional. Merino naturally regulates temperature, wicks moisture, and resists odors, keeping you warm even when wet while maintaining freshness all day. Known for its softness and durability, Merino wool is gentle on the skin and doesn’t itch like traditional wool, offering a cozy, low-maintenance choice for any cold-weather gear collection

Take a moment to check out this Smartwool | Women's Merino 250 -video

• 100% Merino wool fabric made with an interlock knit for comfort, breathability, thermoregulation and odor resistance
• 20cm centre front zip with semilocking slider
• Back body seam wraps to front for body-enhancing fit
• Raglan sleeves & shoulder panels eliminate top shoulder seams
• Flatlock seam construction eliminates chafing
• Heat transfer logo at left sleeve cuff
• Slim fit, close to the body, intended to follow the contours of the body
• Easy care, normal cold machine wash (30-40º), no wool cycle, no special wool detergent required

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