Size Six Water Booties. The high-top bootie features a 5mm neoprene upper, a heavy-duty gusseted zipper, and hook and loop strap to keep them locked on when swimming and helps to reduce water exchange. The thick rubber outsole features a proprietary Stohlquist tread pattern for outstanding traction. The ergonomic shape, which echoes the natural shape of the foot, allows for the best possible fit and comfort in a paddling boot. The ergonomically shaped footbed allows for maximum comfort and warmth. Vulcanized rubber outsole. Rubber toe and heel caps for added protection.