These are scuba diving fins made by CRESSI. The size is S/M. AQUA LUNG marine boots are also included in the set. The size is 26. The rubber straps that hold the fins to the feet are missing due to aging and deterioration. When using them, you will need to purchase replacement rubber straps separately. There is considerable wear and tear, but they are quite sturdy and can still be used. I haven't been scuba diving for a long time, so I'm selling them. An OCEANIC storage bag is included.