Women's Classic Thermal Merino Base Layer Crew

Named Best Overall Base Layers for Women by GearJunkie (2025-2026). Meet the new and improved Women's Classic Thermal Merino Base Layer Crew. We've updated this 100% Merino wool fan favorite with new color options and an enhanced fit to improve functionality while elevating aesthetics. The addition of shoulder panels and its flatlock seam construction help prevent chafing and increase your comfort level. Add one of our best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking. See less Temp Rating: Classic Thermal Warm50° + Cool25° - 50° Cold Base Layer Classic Thermal Merino Made with 100% Merino wool for natural sweat management, odor-resistance, and temperature regulation. Compare Base Layer Styles 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. Classic All-Season Merino Our most versatile year-round fabric features a nylon core for durability, while keeping soft 100% Merino wool next to skin. Classic Thermal Merino This Base Layer Made with 100% Merino wool for natural sweat management, odor-resistance, and temperature regulation. Intraknit™ All-Season Merino Our 3D-knit base layer features a fabric that combines natural benefits of Merino wool with softness and cooling properties of TENCEL™. Intraknit™ Thermal Max Merino Our Intraknit™ technology is helping revolutionize the base layer industry. Including 3D-mapping for a custom fit, durability, and freedom to move. Intraknit™ Thermal Merino Our most advanced performance base layer is 3D-knit to provide a tailored fit with mesh ventilation to balance warmth and breathability. Find your perfect base layer with our quiz. 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 Back body seam wraps to front Raglan sleeves Flatlock seam construction designed to help increase comfort and minimize chafing Made in Vietnam: 100% Merino Wool. Exclusive of Decoration. SW016369 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