O'Neill's Hyperfreak range is renowned as boasting arguably the most flexible neoprene on the market, and that's what the focus of design has been in the Ninja Booties.
These booties are designed with TB3-X neoprene, a seriously flexible and supple neoprene that uses an Envy Foam core rubber (basically a neoprene with a whole lot of volume and not much cell wall for max stretch) as well as TB3-X jersey lining. Basically their most flexible neoprene yet - so you can be sure you'll be feeling unrestricted in the surf. Of course, some durable Krypto Forefoot material is employed on the base of the boots to prevent rapid wear and tear of this super-supple neoprene and to give you some added grip.