Alpha Core Base Layer

Alpha Core Base Layer

Constructed with 100% recycled fabric.

The Alpha Core SL Base Layer was designed for its amazing warmth-to-weight ratio and wet-weather resistance. Thanks to Polartec Alpha-Direct insulation, this base layer will continue to keep you warm even when wet. 

"Light weight, breathable.
Great for all seasons."
— Benjamin M.

"Amazing. Now my favorite
cold weather base layer."
— Tod R.

Ideal for cold days and temperatures between 30° - 45° F.

Polartec® Alpha® Direct
Active insulation that continuously releases excess body heat before it builds to cause saturation and discomfort.

Polartec® Alpha® was invented for the U.S. special forces who required a superior insulation system for extreme temperature variations and the start-stop conditions of combat. 

It has been engineered for consistent warmth, while allowing greater breathability during activity. This air exchange technology creates sustained comfort without the need for shedding layers.