Women's Sperry Syren Gulf Duck Boots Women's Sperry Waterproof Duck Boots. Don't let a little rain keep you inside! Embrace the elements in the Sperry Syren Gulf! These classic boots boast tough uppers, a water-resistant rubber shell, and rubber outsole with Wave-Siping for traction on wet and dry surfaces. Whether you wear them for fashion or function, the Sperry Syren Gulf is sure to be a rainy-day staple!