Apr 03, 2015 Improved fit? Contrary to popular belief, Ninja Sox are best worn after at least one wash/dry cycle. The reason for this is that with no show socks such as Ninja Sox, you're looking for the best, most comfortable fit possible. As you know, most socks tend to resize after a wash and dry cycle. By washing and drying your Ninja Sox, you'll essentially resizing them to a more "normalized" fit....which is essential to minimize slippage with no show socks. In fact, we've had multiple customers reaching out to us about issues with sizing and slippage and after our recommended wash/dry cycle, they notified us that the socks now fit perfectly. Here's an email we received from a customer regarding this: "I did as you suggested and washed and dried the socks. I washed the socks in hot water and also did a fairly warm dry. I did this to maximize the shrinkage. The socks fit perfect now. They do not slip off when walking now. I would like to thank you for your wonderful customer support. I really appreciate it." We hope this helps answer some of your questions. Thanks!