Really nice sock. I have been using standard heavy weight smartwool hiking socks while boarding for years, but finally decided to try something more snowboard specific. Nice height for full coverage slightly above boot top, flex panels at the ankle keep the bulk down, and the lightweight version has been plenty warm on cold east coast days (granted this is probably boot dependent). Am a 10.5 and size L works great, as others mentioned plenty snug without being too tight. Would definitely buy another pair.