First pair required a ?break in? period before they became slip resistant. I normally wear a 7, but as recommended, I found that a 7. Then my husband converted to olukai too. Love the fit, comfort and look of these socks. However, if you are streaming music from a smart phone via Bluetooth, most phones have these features. To my surprise, it DID! I was expecting to have them hold up for one night only but was pleasantly surprised by the quality especially based on price. There were small holes in the wood where the metal holding racks were to be attached so it made it easy to assemble. This was a replacement pair for the last ones I just wore out. Disappointed to the utmost.