The coldest days call for smartest layers possible. Mid 250 Bottom fits bill with Smartwools warmest weight fabric.
The ultra lightweight NTS Micro 150 Pattern Long Underwear Bottoms from Smartwool are made of soft merino wool for incredible warmth to weight ratio.
Great for any activity in cold weather, Smartwool PhD Light long underwear bottoms regulate temperature, wick moisture, retain their shape. Body mapped mesh enhances their performance, yours.
Terramar 2 Layer Authentic Thermal mens long underwear bottoms help keep you warm while skiing on cold winters day or keep you comfortable shoveling snow in driveway.
Originally produced to meet US Army specifications, Terramar Military fleece bottoms also work well for snowsports, ice fishing or building snowmen in backyard with kids.
Made for high output in cooler temps, Arcteryx Phase AR zip neck base layer top is engineered to keep you warm. It offers high performance stretch, wicks/disperse moisture rapidly.