Editing Swimfin (section)

===Full-foot vs open-heel===
Full-foot or closed-heel fins fit like a shoe and are designed to be worn over bare feet or soft neoprene socks; they are sometimes called "slipper" fins.<ref>Jerry Hazzard: ''Discover Underwater Diving'', London: Ward Lock Ltd., 1979, p. 34.</ref> Most fins with complete foot coverage have toe openings for comfort and for ease of water drainage inside the foot pocket. If a larger size is chosen, however, full-foot fins can also be worn over thicker neoprene socks or thin-soled booties. They are commonly used for surface swimming, and come in non-adjustable sizes.

Open-heel fins have a foot pocket with an open heel area, and the fin is held to the foot by springs or straps which are usually adjustable and so will fit a limited range of foot sizes. They can be worn over boots and are common in diving, in particular where a diver has to walk into the water from a shore and requires foot protection. Some manufacturers produce fins with the same blade architecture but a choice of heel type.{{citation needed|date=December 2016}}