We created the Knee Foil primarily as a lightweight UV-ray protection layer, but it also adds a touch of warmth in cool weather. Constructed with our Circular Seamless technology, the Foil fabric is free of any irritating side seams, creating a uniform tubular knit thats ultrasoft against the skin. The top and bottom sections feature a smooth band to securely hold the sleeves in place along your thigh and calf. _x000D_ _x000D_ The Foil yarns are made of polyamide and elastane that transport and evaporate moisture much quicker than traditional polyester blends, resulting in a breathable first layer that keeps your knees protected.