Paying homage to a classic fly-fishing technique, the Spey Fly sock takes its name from Scotlands River Spey and inspiration from their own fly-fishing guru and Mill patriarch, Marc Cabot. Hes the real deal. This lightweight lifestyle sock is too. It features terry loops knit underfoot for cozy cushioning and their signature Merino Wool durable construction. While you may never reel in stream dolphins as Marc does, you can sport the same socks.