The Saturn is the ultimate cold weather base layer, one you'll want to wear on overnights and expeditions alike.

High-output activities like cross country skiing and trail running demand a lightweight breathable top like the Outdoor Research Mens Option Zip Jersey.

The Saturn is the ultimate cold weather base layer, one you'll want to wear on overnights and expeditions alike.

This one-piece suit is ideal for winter mountaineering, backcountry skiing, or other activities in all-day cold. And you could do a lot worse under a dry suit.

Nylon-faced Motion Fleece makes the Outdoor Research Mens Specter Pants versatile enough to wear under you ski shells or alone for trail running and cross country skiing.

The Saturn is the ultimate cold weather base layer, one you'll want to wear on overnights and expeditions alike.

Nylon-faced Motion Fleece makes the Outdoor Research Mens Specter Pants versatile enough to wear under you ski shells or alone for trail running and cross country skiing.

High-output activities like cross country skiing and trail running demand a lightweight breathable top like the Outdoor Research Mens Option Zip Jersey.

Nylon-faced Motion Fleece makes the Outdoor Research Mens Specter Pants versatile enough to wear under you ski shells or alone for trail running and cross country skiing.

The Saturn is the ultimate cold weather base layer, one you'll want to wear on overnights and expeditions alike.

This one-piece suit is ideal for winter mountaineering, backcountry skiing, or other activities in all-day cold. And you could do a lot worse under a dry suit.