C4 300 pocket matched with the Maverick American carbon blade. First thing I noticed was the how comfortable the foot pocket was once "slipping" it on. Hopping in the water the kick seemed easy on my ankles and taking a lot of pressure off my legs. On my first dive I felt like I was not moving in the water but reached the bottom with plenty of breath to spare. Long story short my bottoms times increased while using the blades. The foot pockets provided a stiff platform for no energy loss from leg to fin. Overall I’m very excited about these foot pockets, they are efficient, comfortable, and easy to use. Makes for great diving!