The best long underwear are insulating, moisture-wicking, odor-resistant, comfortable, will keep their shape, and will last for years with a little care.
Read More
How To: Expert Advice & Skills
How to Choose Gear
Cleaning, Repair, & Maintenance
Learn Outdoor Skills
How to Thru-hike
En Español
All Trip Guides
Thru-hikes for Working People
Backpacking Trips
Thru-hikes
Rafting, Canoeing, and Fishing Trips
Bikepacking Trips
All Gear Reviews
Outdoor Footwear
Outdoor Apparel
Backpacking & Thru-Hiking
Hiking
Running
Ski and Snow Gear
MTB, Bikepack & Bicycle Touring
Women's Outdoor Gear & Clothing
GPS & Electronics
Climbing
Water Sports
Camping
Sun Protection
Fitness & Nutrition
Travel Gear
All Gear Lists
Staff Picks
Backpacking & Thru-hiking Gear Lists
Running Gear Lists
Ski and Snow Gear Lists