Simms Guard Socks - Essential to wear under your wading boots when you're wet wading. It is a wet-suit for you foot and fills the space that your waders would typically take with a comfortable and "cushy" sock. They are a combonation of a sock and a gravel guard so these Guard Socks keep annoying sand and gravel out of your boots and socks. This allows you to wet wade in those "fringe" conditions when waders might be too warm, and a sandal might be too cold as well. A must have.