The Lightest Weight Polartec Power Wool 

Silkweight Power Wool features a smooth face with a micro-grid back and it has a lovely cotton feel. Polartec's Power Wool is a bi-component knit that combines the best features of both natural and synthetic fibres, without blending - a first of its kind!  By placing each distinct fibre where it can work to its highest potential (merino wool against the skin and polyester on the face), Polartec® has created a fabric that is soft, odor resistant, and durable.

Wool fibers offer increased base comfort by retaining insulation and breathability even when wet. Their absorbent nature pulls moisture vapor away from your skin, transferring it to the outer synthetic layer where it expands and evaporates more quickly. This mechanical wicking action allows Polartec Power Wool™ to keep moisture in motion at all times.