When I lived in New York I used the 5 or 7mm Solites and they're great. Really thin and warm until the water starts to seep in. Maine Surfers Union and maybe some other East Coast shops have been posting about the Axxe 7mm socks. They look nice because you can turn them completely inside out to dry them faster. Never tried it with a normal bootie. Could be hard to put them on since there's no pull tab on the heel.