Arcopedico's most popular style, the LS, is lovingly known as "Shocks," because they are practical like shoes and comfortable like socks!       The LS features a blend of techno elastic upper technology with the use of a special knitted nylon fibers that provides a controlled freedom of your foot shape. Lined with a soft interior for barefoot wear and built-in SanSmell™ technology to promote an anti-bacterial environment for overall foot health. The twin-arch support technology of the sole provides all-day support and keeps your feet comfortable and happy.       The flexible and forgiving upper material will not restrict your feet in any way and the lace-up design allows for a truly custom fit. The knit material molds and moves with the shape of your foot providing the utmost comfort for even the most problematic feet.       These are go-to travel and walking favorite plus they are perfect for those who are on their feet all day including doctors, nurses, and service industry professionals. They are machine washable and 100% free of animal products! SIZES EUROPEAN SIZE US SIZE WOMEN'S MEN'S 35 4.5 - 5 36 5.5 - 6 37 6.5 38 7 - 7.5 39 8 - 8.5 40 9 7.5 - 8 41 9.5 - 10 8.5 - 9 42 10.5 - 11 9.5 43 12 10 44 13 10.5 45 11 - 11.5 46 12