Smartwool Classic Thermal Merino Base Layer 3/4 Bottom
The Smartwool Classic Thermal Merino Base Layer 3/4 Bottom solves one of the most common annoyances with traditional long underwear: too much fabric inside your ski boots. By shortening the legs to sit above your boot cuffs, Smartwool eliminates unnecessary material around your shins and calves while maintaining the warmth and comfort of a full-length thermal base layer everywhere else.
Made entirely from Merino wool, these bottoms use a 250 g/m² interlock-knit fabric that provides substantial insulation without sacrificing breathability. Merino naturally regulates temperature, manages moisture, and resists odors, helping keep you comfortable whether you're skiing hard or spending a little too much time on a freezing chairlift.
The slim fit follows the contours of your body, making these easy to layer underneath insulated ski pants or a shell. Flatlock seams help minimize rubbing and irritation, while the Merino-lined elastic waistband provides a comfortable fit against your skin. A functional fly adds a little everyday practicality.
For skiers who appreciate a properly fitted boot, the three-quarter-length design is a significant advantage. Less fabric inside your boots means fewer potential pressure points, less bunching, and a cleaner fit around your lower legs. You still get all the benefits of a warm Merino wool base layer, just without the extra material where you don't need it.
Tech Specs
Care Instructions
Shipping Information
We aim to dispatch all orders within 2 business days, and in most cases your order will be boxed and shipped within 24 hours. Rest assured, if you've received your order confirmation email, our team is working hard to get your order to you as quickly as possible. If you have any questions, please visit our FAQ page or contact our customer service team.
Orders will be shipped out of the nearest location to you with the item(s) ordered in stock.
For more information on estimated transit times and shipping costs click here.
Return Policy
All returns must be made within 90 days of your purchase date and must be in new condition (tags attached, unused, unwashed, and unworn).
We will provide a return label on items being returned with a purchase price of $250 or more, please contact us if your return meets this criteria.
To read our full return policy click here.