Smartwool Classic Thermal Merino Baselayer Bottom - Men's
4.7 rating (3 reviews)A soft, slim-fitting men’s thermal baselayer bottom made from 100% merino wool for cold-weather hiking, camping, and winter layering, with midweight warmth and natural temperature regulation.
Free shipping on orders over $70. Easy returns within 30 days.
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Product details
A soft, slim-fitting men’s thermal baselayer bottom made from 100% merino wool for cold-weather hiking, camping, and winter layering, with midweight warmth and natural temperature regulation.
Cold-Weather Comfort
Smartwool’s Classic Thermal Merino Baselayer Bottom brings soft, dependable warmth to cold hikes, camp mornings, and winter layering systems. The 100% merino wool fabric helps regulate temperature so you can stay comfortable through changing effort levels.
- Soft 100% merino wool construction
- Midweight warmth for cold-weather layering
- Designed for hiking, camping, touring, and everyday winter use
Fit & Layering
A slim fit keeps the fabric close to the body for efficient warmth and easy layering under pants or shells. It’s built to reduce bulk while still delivering the cozy feel expected from a thermal baselayer.
- Slim fit for next-to-skin layering
- Low-bulk profile under outer layers
- Men’s sizing available from S to XXL, depending on color
Merino Performance
Merino wool is known for balancing warmth and moisture management, making it a strong choice for stop-and-go activity in cool to cold conditions. It helps keep comfort consistent on climbs, descents, and relaxed time around camp.
- Helps regulate temperature during varied activity
- Comfortable next-to-skin feel
- Useful for long days outside
Colors & Availability
Choose from versatile outdoor-ready colors including Black, Charcoal Heather, Deep Navy, and Winter Moss Heather. Availability varies by size and color.
- Available colors: Black, Charcoal Heather, Deep Navy, Winter Moss Heather
- Price: $125
- Select size and color to see current availability
Tech specs
- Brand
- Smartwool
- Product Name
- Classic Thermal Merino Baselayer Bottom - Men's
- Material
- 100% merino wool
- Insulation Weight
- Midweight
- Fit
- Slim
- Category
- Men's hiking and camp baselayers
- Available Colors
- Black, Charcoal Heather, Deep Navy, Winter Moss Heather
- Available Sizes
- S, M, L, XL, XXL
Care and maintenance
Follow the garment care label for washing and drying. Close zippers and fasteners before washing to help preserve fabrics and finishes.
Shipping and returns
Free shipping for orders over $70. Unused gear can be returned within 30 days.
Questions and answers
Is this baselayer bottom warm enough for winter use?
Yes. The Classic Thermal Merino Baselayer Bottom is a midweight layer designed to add warmth under hiking pants, ski shells, or camp layers in cold conditions.
How does it fit?
It has a slim fit, so it is intended to sit close to the body for efficient layering without excess bulk.
Is the fabric comfortable against skin?
Yes. The 100% merino wool construction is naturally soft and helps regulate temperature, making it comfortable for long days of hiking, touring, or camping.
Is it a good choice for backpacking or hut trips?
Merino wool is well suited to multi-day use because it helps manage moisture and temperature while staying comfortable over extended wear.
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