Patagonia Men's R1 Thermal Bottoms

Patagonia Men's R1 Thermal Bottoms are the definitive choice for active insulation when your output level is as variable as the mountain weather. These versatile, midweight base layer bottoms are engineered to provide exceptional warmth, stretch, and breathability during high-exertion activities in cold conditions, ensuring you stay comfortable on both the ascent and descent.

Best Used For

These bottoms excel as a primary base layer for a wide range of cold-weather pursuits. They are ideal for ski touring, alpine climbing, ice fishing, winter trail running, and cold-weather backpacking where regulating temperature and managing moisture is critical. They can also serve as a streamlined midlayer over a lighter base in truly frigid conditions.

Key Features

• Polartec Power Grid fabric provides an outstanding warmth-to-weight ratio while remaining highly breathable.
• The internal grid pattern wicks moisture away from the skin and traps heat efficiently.
• HeiQ Pure odor control is integrated into the fabric to keep the garment fresh over extended use.
• A fully gusseted crotch offers a full range of motion for climbing and skiing.
• The brushed elastic waistband is soft next to the skin for all-day comfort.
• Flatlock seams are used throughout to minimize chafing when worn under shells or other layers.
• This product is Fair Trade Certified sewn.

Why We Like It

What truly sets the R1 Bottoms apart is the intelligent design of the Polartec Power Grid fabric. Unlike standard thermal fabrics that can feel stifling during activity, the R1's grid construction creates open-air channels that vent excess heat and moisture with incredible speed. Simultaneously, the solid grid points retain warmth, creating a microclimate that actively regulates your temperature. This means you can push hard on a steep skin track without overheating and stay warm during a windy ridge-top transition, often eliminating the need to stop and shed or add layers. It's this active temperature regulation that makes it an indispensable tool, not just another piece of long underwear.

Fabric/Material Composition

The body is constructed from 6.9-oz Polartec Power Grid, which is composed of 93% recycled polyester and 7% spandex. The fabric is treated with HeiQ Pure odor control and is bluesign approved.

How It Fits

These bottoms feature a slim fit that is designed to sit close to the skin. This ergonomic fit enhances the fabric's moisture-wicking properties and allows for easy, bulk-free layering under shell pants or midlayer insulation without restricting movement.

Sizing Availability

Available in Men's sizes X-Small through XX-Large.

Care Instruction

Machine wash on a cold, gentle cycle with similar colors. Tumble dry on low heat. Do not use bleach or fabric softeners as they can inhibit the fabric's wicking performance. Do not iron or dry clean.