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When the temperature drops, the right base layer does the quiet work. Our Men's Base Layer Bottoms keep you warm, dry and comfortable across hike, run and travel. Explore our men's merino base layer for natural warmth that moves with you. Also shop women's thermal leggings and our full range of women's merino base layer options.
Q: How should my base layer bottoms fit?
A: Your base layer bottoms should fit snugly without restricting movement, acting as a second skin to efficiently wick moisture away and maintain warmth. They should offer flexibility and not bunch up under your outer layers. Be sure to visit our size chart.
Q: Can base layer bottoms be worn for activities beyond winter sports?
A: Yes! While designed for thermal efficiency in cold weather, our all-season Merino base layer bottoms are versatile enough for hiking, camping, and other outdoor activities in milder conditions.
Q: Why choose Merino wool for base layer bottoms?
A: Merino wool's natural properties include moisture management, odor resistance, and temperature regulation, making it an ideal material for base layer bottoms. Its fine fibers provide a soft, non-itchy feel against the skin for all-day comfort.
Free Return Policy
Smartwool offers free returns within 30 days from the date of purchase. Items must be unused, unwashed, and unaltered.
Store Returns
Return the unworn item(s) to the store where you originally made the purchase for a refund or exchange.
Online Returns
Return unworn item(s) purchased at smartwool.com 30 days from the date of purchase for a complete refund. Initiate a return by accessing your order history and selecting “Return Items."
We are currently offering free shipping on orders €55+ placed on eu.smartwool.com.
Shipping based on normal carrier restrictions and delays. We cannot guarantee arrival. Free shipping may not be available for some customers.

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