Here's an economical bootie that offers solid protection for any type of boating. It's got a warm 3mm neoprene upper and a comfortable 5mm insole. The Tread-3's™ thicker sole offers more protection than the Paddlers Pull-On, and the gusseted zipper makes them easy to get on and off. (Whole sizes only.) Women order one size smaller. 1/2 sizes order one size larger. Back neoprene panel color coded by size.