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 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!