Women’s Thermal Underwear & Base Layers

Women’s Thermal Underwear & Base Layers

Women’s thermal underwear and base layers for cold weather, hiking, travel, sport and everyday outdoor use. The collection includes merino and merino-blend tops, thermal pants, leggings, technical synthetic base layers and selected complete sets.

How to Choose Women’s Thermal Underwear

• Merino: useful for warmth, moisture management and comfortable wear in colder conditions.
• Technical synthetics: quick-drying options suit higher activity levels and frequent changes in intensity.
• Warmth: compare fabric weight, construction and intended season rather than relying on one material alone.
• Layering: base layers should fit close to the body without restricting movement under fleece, softshell or insulated clothing.
• Sets vs separates: choose a complete set for convenience or mix tops and bottoms based on the activity and temperature.

For a broader overview, browse all thermal underwear. If you are comparing merino, synthetic and blended materials, read our guide to choosing thermal underwear and base layers.

Planning a wet-weather hike? Combine a comfortable base layer with suitable outer protection: browse our women’s rain and waterproof jackets. For additional comfort in hiking boots, explore hiking and merino socks.