The Gara Foot Pocket Kit (one pair) is sold separately, allowing the user to install any standard aftermarket blades with either angled or straight designs. The interchangeable system enables divers to swap out the fin blade for specific diving situations, making this fin perfect for growing alongside the diver's increasing skill level. Any thermoplastic or carbon fiber blade from Cressi can be replaced in minutes without any modifications. The foot pocket is constructed using the most advanced multi-compound bonding process to provide a foot pocket that offers comfort and flexibility around the foot where desired, while maintaining stiffer connections under the foot pocket and in the heel area where power transfer occurs. The self-adjusting foot pocket expands to fit comfortably with or without socks. The Gara Foot Pocket Kit is wider than other Gara fin models. We recommend using them with neoprene socks to ensure a good fit. They are sold in pairs and are made in Italy by Cressi. Cressi is an Italian brand that has been pioneering diving, snorkeling, and swimming gear since 1946.