A swim fin includes a foot pocket with a front and rear sections, an upper portion formed of an elastomeric material, a sole, and a foot pocket cavity. The rear section has a rear edge defining the foot pocket cavity. The foot pocket further has an array of through holes disposed through the upper portion adjacent the rear section. The array of through holes is sized and configured to generally increase a surface area of the rear section from the rear edge towards the front section. The swim fin includes a fin blade extending from the front section of the foot pocket. The swim flu may further include an adjustable heel strap. The fin blade may further include side rails attached to the foot pocket with hinges. The fin blade may further include a flex member disposed between first and second body members.

A method for providing a swim fin includes providing a foot attachment member and a blade member having a predetermined blade length. The blade member has a soft portion made with a relatively soft thermoplastic material. The method includes providing a relatively harder portion and the relatively soft thermoplastic portion that is molded to the relatively harder thermoplastic portion. The method includes providing an orthogonally spaced portion of the relatively harder portion that is arranged a predetermined orthogonal direction while said swim fin is in state of rest. The method includes providing the blade member with a predetermined biasing force portion that is arranged to urge the orthogonally spaced portion while the swim fin is in a state of rest. The method includes arranging a significant portion of the blade length to experience pivotal motion a lengthwise angle of attack during use.

A method for providing a swim fin includes providing a foot attachment member and a blade member having a predetermined blade length. The blade member has a soft portion made with a relatively soft thermoplastic material. The method includes providing a relatively harder portion and the relatively soft thermoplastic portion that is molded to the relatively harder thermoplastic portion. The method includes providing an orthogonally spaced portion of the relatively harder portion that is arranged a predetermined orthogonal direction while said swim fin is in state of rest. The method includes providing the blade member with a predetermined biasing force portion that is arranged to urge the orthogonally spaced portion while the swim fin is in a state of rest. The method includes arranging a significant portion of the blade length to experience pivotal motion a lengthwise angle of attack during use.

A monofin, for use in swimming, includes a fin shaped like a whale tail, wherein the fin further includes a leading edge and a trailing edge. At least one corrugation is formed in the fin, wherein the at least one corrugation is parallel to a portion of the leading edge. At least one foot pocket assembly may be removably coupled to the fin. The at least one foot pocket assembly includes a foot pocket cover formed to removably couple around a portion of the fin. At least one foot opening is formed in the foot pocket cover and at least one cuff surrounds the at least one foot opening. At least one foot pocket is in communication with the at least one foot opening. The at least one cuff stretches to encompass an ankle of users of many sizes and holds the monofin on the users.

The present disclosure relates to a swim instruction aid comprising a buoyant member, a shell, and a handle coupled to the shell and/or buoyant member. Methods of swim instruction using the swim instruction aid comprise instructing a student to grasp a first swim instruction aid in a first hand and, optionally, a second swim instruction aid in a second hand, wherein the student grasps the first and optional second swim instruction aids using the handles thereof; and instructing the student to practice a swimming skill while in the water and while using the first and optional second swim instruction aids to increase the student's buoyancy, wherein the student practices the swimming skill until the student achieves a predetermined proficiency level.

The present disclosure relates to a swim instruction aid comprising a buoyant member, a shell, and a handle coupled to the shell and/or buoyant member. Methods of swim instruction using the swim instruction aid comprise instructing a student to grasp a first swim instruction aid in a first hand and, optionally, a second swim instruction aid in a second hand, wherein the student grasps the first and optional second swim instruction aids using the handles thereof; and instructing the student to practice a swimming skill while in the water and while using the first and optional second swim instruction aids to increase the student's buoyancy, wherein the student practices the swimming skill until the student achieves a predetermined proficiency level.