Level 4- Heavy Weight - this is our heaviest base layer fabric featuring our heavy weight fleece backed fabric to keep you insulated in temperatures 15° to below 0°. The fabric content is 95% Polyester / 5% Spandex (300gsm) with treatment to provide Thermoregulation, UV Protection 25+, Moisture Management, and Odor Control

This top is significantly thicker and heavier than level 3 – Level 4 is designed to provide protection in frigid temperatures, against wind chill and blizzard conditions.

Excellent Flexibility: The men's base layer clothing is designed with four way stretch & compression for your freedom of outdoor activities.

Moisture-Wicking Features: With their moisture transport system, the men's base layer tops wick away sweat fast to keep you dry and light. You no longer have to worry about that sticky or clammy feeling as work out or lounge at home. Your comfort and dryness are assured.

Delivers a comfortable and chafe-free fit: the men's base layer tops fit securely with crew neck cut. The poly-spandex material with anti-microbial properties offers breathability allowing odor to escape.

Colossum Outdoors Men’s Multi Level Base Layer Cold Weather Long Sleeve Thermal Top (Medium Level 4- Heavy Weight) Black