A swim fin adapted to be used in the swimming or walking mode having a foot engaging portion adapted to be worn by a user and a two-part fin formed of an inner portion and outer portion which are connected to each other and rotatable with respect to each other using a suitable hinge assembly so that the outer portion may be folded on top of or under the foot wearing portion to facilitate walking and to enable the outer portion to be extended to facilitate swimming. Suitable locks are provided to maintain the fin portions in the extended or folded positions.
