Snowflake Rating System

The Snowflakes on each style of underwear help you determine your needs. The Kenyon Snowflake Rating system has been devised to simplify your selection of thermals.
  Lightweight Medium Weight Expedition Weight
Thermal Polypropylene Rib
Silkyester
Poly-Lite Rib
Outlast® Rib
Poly/Wool/Polypro
Kenyon BiComponent
Outlast® BiComponent
Everywear
Merino Wool
Eco-Thermals
Power Stretch Fleece
Polarskins Fleece
Rating     
Recommended
Usage
Moderate weather with little activity; continuous activity in cold weather Moderate to cold weather with some activity; cold weather when you alternate between activity and rest. Sub-freezing temperatures at any level of activity.
Applied Sports &
Activities
Cross Country Skiing, Running, Hiking, Cycling. Walking, Standing, Skiing, Snow Boarding, and Ice Skating on extremely cold days. Winter Camping, Climbing, and Hunting