FITS Film OTC: Ultra Light, Over the Calf, High Performance Wool Ski Sock 6% polyester FILM: Introducing the lightest/best fitting high-performance ski sock on the planet. The FITS Film is as thin as film while still providing the benefits of a Superfine Merino wool sock in an over the calf length that falls just below the knee. TYPE: The new Film is 40% lighter than our Ultra Light Ski sock, but nothing has been compromised in the way of fit. FITS Film features the closest foot to boot interface to provide the best feel and control directly from your foot to the ski. FIT: Engineered using FITSs innovative, full contact fit technology and dynamic toe cup to contour to the shape of your foot. The patented heel lock provides heel security that limits the chances of a blister when combined with a properly fit boot. CUSHION: This sock features zero cushioning, so youll want to pair the Film with a tight-fitting boot, as it offers zero interference between your foot and your boot. The over the calf length falls just below the knee. FABRIC: Each pair of these socks is made of high-tech yarn with a majority content of luxurious Merino wool. The specific ingredients for the ultimate in comfort are 68% super-fine Merino, 24% quality Nylon, 6% polyester blend and 2% stretch Lycra.