I have been wearing Naot and Birkenstock sandals and shoes for 15 yrs, on the advice of my orthopedist, to support my arches, prevent foot rolling from supination and help keep my knees pain free. I like both brands, but find Naots to be generally more attractive than Birkis. My husband bought a pair of Naot sandals locally and has worn them for about 4 yrs. He bought my son a pair that is worn almost every day in Texas heat. finally my husband's pair wore out and he ordered a replacement pair on Amazon. Happy feet, knees and customers. My son's pair needs new liners, an option available to extend the life of the sandals. Highly recommend for anyone with any feet, knee or back pain.