Meet the Women’s Classic Thermal Merino Base Layer Crew One Piece, which provides a full-body layer of warmth. This 100% Merino wool one piece combines the moisture management, temperature regulation, and odor resistance of Merino with the comfort of an interlock knit. Featuring a fully functional fly, a zippered drop seat, set-in sleeves, and a flatlock seam to help prevent chafing, this base layer is designed for easy wear and maximum comfort.
Base Layer
Smartwool Base Layers
Responsibly sourced, naturally performing Merino wool—helping you stay dry from sweat, resistant to odors, and comfortable at the right body temperature 365 days a year.
Features
- Our slim fit is intended to follow the contours of the body
- Fabric helps combine the moisture management, temperature regulation, and odor resistance of 100% Merino wool with interlock knit for comfort
- Flatlock seam construction designed to minimize chafing
- Set-in sleeves
- Side seams wrap to front for a more distraction-free fit
- Zippered drop seat
- Made in Vietnam: 100% Merino Wool. Exclusive of Decoration.
- SW002985
Care
- Machine Wash Warm Gentle Cycle
- Wash With Like Colors
- Do Not Bleach
- Tumble Dry Low
- Cool Iron As Needed
- Do Not Iron Decoration
- Do Not Dry Clean
Classic Thermal
Our fan favorite base layer made from 100% ZQ Merino wool. Ideal for cold-weather activities where warmth and breathability are crucial.









































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