The Smartwool Classic Thermal Merino Women's Base Layer Bottoms bring cozy warmth and natural performance to cold days on the mountain. Made from 100% merino wool, these midweight 250g/m² thermal leggings naturally regulate body temperature, wick moisture, and resist odors to keep you warm, dry, and comfortable from first chair to last run. The soft interlock knit fabric and updated slim fit make layering under ski pants easy, while flatlock seams help prevent chafing during active days. A comfortable mid-rise waist with merino-lined elastic stays snug without digging in. Perfect for skiing, snowboarding, hiking, and everyday winter adventures, these women's merino wool base layer bottoms are a cold-weather essential you'll reach for all season.

Key Specifications

Material 100% Merino Wool

Fabric Weight 250 g/m²

Warmth Classic Thermal

Fit Slim Fit

Waist Mid-Rise

Construction Interlock Knit

Smartwool Technologies

Moisture Management Technology

Odor Resistant Technology

Body Temperature Regulation Technology

100% Merino Wool Fabric

Start-Stop Activity

250 g/m² Midweight Merino Fabric

Key Technologies & Features

100% Merino Wool

Made entirely from merino wool, these base layer bottoms provide natural moisture management, temperature regulation, and odor resistance. The soft fibers feel comfortable against the skin while delivering reliable warmth for skiing, snowboarding, hiking, and other cold-weather activities.

Classic Thermal 250 g/m² Fabric

The midweight 250 g/m² fabric provides dependable insulation for cold winter conditions. Its substantial yet breathable construction makes these thermal leggings an excellent choice beneath ski pants, snowboard pants, and other winter outerwear.

Interlock Knit Construction

The soft interlock knit combines the natural performance of merino wool with a smooth, comfortable feel against the skin. Its construction provides warmth and flexibility while making it easy to layer beneath winter clothing.

Natural Moisture Management

Merino wool naturally helps manage perspiration by absorbing moisture vapor and moving moisture away from the skin. This helps maintain comfort during active runs, winter hikes, and changing activity levels throughout the day.

Temperature Regulation

Merino fibers naturally help regulate body temperature, providing insulation when conditions are cold while allowing excess heat and moisture to escape during physical activity. This adaptability makes the bottoms comfortable through varying winter temperatures.

Natural Odor Resistance

The natural odor-resistant properties of merino wool help keep these base layer bottoms fresher through extended wear. This makes them a practical option for long days on the mountain, winter travel, and multi-day adventures.

Updated Slim Fit

The slim fit follows the contours of the body for comfortable next-to-skin layering. Its streamlined shape helps reduce excess fabric and bunching beneath ski or snowboard pants while allowing natural movement.

Mid-Rise Waist

A comfortable mid-rise waist provides a secure fit that stays in place during active movement. The design offers everyday comfort and dependable coverage without unnecessary bulk beneath additional layers.

Merino-Lined Elastic Waistband

The elastic waistband is lined with soft merino wool for added next-to-skin comfort. It provides a snug, supportive fit while helping minimize irritation during long days of skiing, snowboarding, or hiking.

Flatlock Seam Construction

Flatlock seams create a smoother surface against the skin to help reduce rubbing and chafing. This low-profile construction improves comfort during repetitive movement and when layering beneath fitted winter outerwear.

Technical Specifications

Product	Smartwool Classic Thermal Merino Women's Base Layer Bottoms
Gender	Women's
Material	100% Merino Wool
Fabric Weight	250 g/m²
Warmth Category	Classic Thermal
Fit	Slim
Waist	Mid-Rise
Waistband	Merino-Lined Elastic
Fabric Construction	Interlock Knit
Seams	Flatlock Construction
Inseam	30.5 in / 77.5 cm (Size Medium)
Moisture Management	Natural Merino Wool
Odor Resistance	Natural Merino Wool
Temperature Regulation	Natural Merino Wool
Recommended Activities	Skiing, Snowboarding, Hiking, Winter Outdoor Activities
Country of Manufacture	Vietnam

Care Instructions

Machine Wash Warm, Gentle Cycle

Wash With Like Colors

Do Not Bleach

Tumble Dry Low

Cool Iron As Needed

Do Not Iron Decorations

Do Not Dry Clean

Women's Size & Fit Chart

Measurement	X-Small 0–2	Small 4–6	Medium 8–10	Large 12–14	X-Large 16–18
Chest	32–33"81.5–84 cm	34–35"86.5–89 cm	36–38"91.5–96.5 cm	39–40"99–101.5 cm	41–44"104–112 cm
Waist	24–25"61–63.5 cm	26–27"66–68.5 cm	28–30"71–76 cm	31–34"78.5–86 cm	35–38"89–96.5 cm
High Hip	31–32"78.5–81.5 cm	33–34"84–86.5 cm	35–36"89–91.5 cm	37–39"94–99 cm	40–43"101.5–109 cm
Hip	35–36"89–91.5 cm	37–38"94–96.5 cm	39–40"99–101.5 cm	41–43"104–109 cm	44–47"112–119.5 cm
Inseam	29–30"73.5–76 cm	30–31"76–78.5 cm	31–32"78.5–81.5 cm	32–33"81.5–84 cm	33–34"84–86.5 cm
Arm Length	27–28"68.5–71 cm	28–29"71–73.5 cm	29–30"73.5–76 cm	30–31"76–78.5 cm	31–32"78.5–81.5 cm