Zura Alpha Fins are Made of buoyant closed cell EVA foam to force the leg to work the down kick while increasing ankle flexibility. If you desire to improve your kick and your overall feel for the water then the Zura Alpha fins are the key.   Zura Alpha Fins teach you to lift and push the water with your down kick while other swim fins teach you only to push the water in a one directional kick.   Sizing ranges from xxs-xxl

Full Line of Zura products can be seen at 

http://www.idutri.com/swim-products.html