When it's too warm for our waders, the Simms Guide Guard Sock picks up the slack to protect our feet for long days in our wading boots. The cushy neoprene construction gives us a snug and abrasion-free fit under our wading boots while insulating us against cooler underwater currents. We also like the gravel guards, which hook onto our boot laces and seal around the ankle to keep sand and gravel out of our boots for fewer blisters, cuts, and cusswords when we're wading.