There are two types of Xtratuf boots, the original triple dipped neoprene style called Xtratuf Legacy and the more recent hybrid neoprene bootie and rubber style - which are known as Xtratuf II's. The Legacy Xtratuf boots are triple dipped neoprene rubber that is softer, lighter and far more pliable than ordinary rubber. Xtratuf insulated boots offer a total protection shield of seamless, watertight protection for the most severe fishing and work conditions. The new Xtratuf II style offers the best of both worlds featuring the comfort of Muck Boots with the slip-resistant sole of original Xtratuf boots. Men's and Women's Xtratuf sizing chart for insulated neoprene boots is listed at the bottom of each product page.