Oddball Royale's signature Loafer Sock features a true "No Show" fit, a non-slip gel insert on the heel and tailored non-binding stay-on construction. Seamless for a smooth fit with no irritation. Perfect for your summer boat shoe or any other shoe you want to appear sockless in. Like all Oddball Royale socks, they are made with All Natural Bamboo fibers -- an ultra soft, renewable resource. Size XXL fits men's shoe sizes 14-18.