Bridgedale(R) socks are designed to perform in tough winter weather while providing the user with the utmost warmth and comfort. Micro Fit socks features:; An ultra lightweight sock that's form fitting like a second skin. A super thin toe seam. Excellent base layer for moisture management. The lightest and thinnest ski sock made achieve the closest possible boot fit. Ideal for custom fitted boots. Consists of 54% polypropylene, 43% nylon, 3% Lycra(R). Precision Fit socks features:; A lightweight performance ftiied sock with cushioned underfoot for added comfort. Graduated compression for calf comfort. Mapped toe and forefoot cushioning for warmth. Shin pad shape improves boot tongue comfort. Consists of 40% merino wool, 39% polypropylene, 19% nylon, 2% Lycra(R). Available in a 2 pair variety pack.