Lightweight Men's Wool Bottom Base Layer - 100% Merino Wool

Lightweight Merino Warmth Without the Bulk: The Men’s Wool Bottom Base Layer

When the weather calls for a little extra warmth but a heavyweight thermal layer would be too much, the Men’s Lightweight Wool Bottom Base Layer provides comfortable insulation in a streamlined, breathable design. Made from 100% Australian merino wool, the lightweight 170 g/m² jersey fabric fits comfortably beneath hiking pants, ski gear, workwear, or everyday clothing without adding unnecessary bulk.

Fine 17.5-micron fibers provide a soft next-to-skin feel, while merino’s natural temperature and moisture regulation help keep you comfortable as your activity level changes.

Thoughtful Design & Materials

100% Merino Wool: Made entirely from Australian merino wool for natural warmth, breathability, moisture management, and odor resistance.

Lightweight Jersey Knit: The 170 g/m² fabric provides light insulation that works particularly well in milder temperatures and during active pursuits.

Fine 17.5-Micron Fibers: Exceptionally fine merino fibers create a soft feel designed for comfortable next-to-skin wear.

UPF 25 Protection: The lightweight merino fabric provides additional UV protection when worn in exposed conditions.

Easy-Care Construction: Machine-washable and tumble-dry compatible for easier care between adventures.

Designed for Comfortable Layering

Mid-Rise Fit: The waistband sits slightly below the belly button for a comfortable fit beneath additional layers.

Merino-Covered Waistband: Places soft merino wool next to your skin rather than leaving elastic directly exposed.

Ribbed Ankle Cuffs: Help keep the legs securely positioned when pulling pants, bibs, or other layers over the top.

Flatlock Seams: Smooth seam construction helps minimize rubbing and chafing during extended activity.

Regular Fit: Provides a little room to move without becoming excessively loose beneath your outer layers.

Built to Move With You

Gusseted Construction: A gusset reduces stress through the crotch area while providing greater freedom of movement for hiking, running, skiing, and other active pursuits.

Lightweight Feel: At just 7.2 ounces in a size large, the bottoms provide added warmth without significantly increasing the weight or bulk of your clothing system.

Base-Layer Design: Wear them directly against the skin beneath hiking pants, snow pants, workwear, or casual clothing.

True-to-Size Fit: Designed around standard sizing for a comfortable base-layer fit.

Natural Merino Performance

Temperature Regulation: Merino wool helps retain warmth when temperatures drop while allowing excess heat to escape as your activity level increases.

Moisture Management: Wool fibers absorb moisture vapor from your skin and release it into the surrounding air, helping you stay more comfortable during active days.

Naturally Odor Resistant: Merino helps resist odor-causing bacteria, making these bottoms especially useful for travel and multi-day outdoor adventures.

Insulates When Damp: Unlike materials that quickly lose their insulating ability when exposed to moisture, merino continues to provide warmth when damp.

Breathable by Nature: The structure of merino fibers allows airflow while still providing insulation, helping prevent a lightweight base layer from becoming overly warm during activity.

Product Details

• Product Type: Men’s Lightweight Base Layer Bottom

• Fiber Content: 100% Merino Wool

• Wool Source: Australia

• Knit: 170 g/m² Lightweight Jersey

• Fiber Diameter: 17.5 Microns

• UPF Rating: 25

• Rise: Mid Rise

• Waistband: Merino Covered

• Gusset: Yes

• Ankle Cuffs: Ribbed

• Seams: Flatlock

• Layer Type: Base Layer

• Fit: Regular

• Sizing: Runs True to Size

• Weight: 7.2 oz / 204 g, Size Large

• Style #: 719

• Imported

Best Suited For

• Hiking

• Camping

• Skiing and snowboarding

• Running

• Biking

• Fishing

• Hunting

• Everyday cold-weather wear

• Travel

• Transitional-season layering

Temperature Recommendations

• Active Use: Approximately 30°F to 60°F and above

• Inactive Use: Approximately 60°F and above

Actual comfort will vary based on activity level, additional layers, weather conditions, and individual temperature tolerance.

Care Instructions

• Turn inside out before washing

• Machine wash cold on gentle cycle with like colors

• Use mild or wool-specific detergent

• Tumble dry on low heat

• Do not use fabric softener

• Do not use bleach

• Store in an airtight container during extended periods of non-use

Just Enough Warmth for Active Days

The Men’s Lightweight Wool Bottom Base Layer fills the gap between going without thermals and reaching for heavier winter insulation. Its fine 17.5-micron merino wool feels comfortable against the skin, while the lightweight jersey knit adds warmth without restricting movement or creating unnecessary bulk. From chilly trail mornings to long days beneath ski gear, it’s an easy foundation for staying comfortable when conditions call for just one more layer.