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A monofin is a type of swimfin typically used in underwater sports such as finswimming, free-diving and underwater orienteering. It consists of a single or linked surfaces attached to both of the diver's feet. The diver's appearance is then reminiscent of a mermaid or merman.
To differentiate between the use of monofins and conventional fins, the latter are sometimes referred to as stereo fins or bi-fins.
The monofin swimmer extends arms forward, locking hands together, locking the head between the biceps. The undulating movement starts in the shoulders, with maximum amplitude towards the hips, the legs almost don't bend to transfer the movement to the monofin. This technique is called the dolphin kick.
By slowly oscillating the surface of the monofin when submerged, divers can generate large amounts of thrust even with small or slow movements. This preserves energy which helps when breathholding (apnea).
History and production
Monofins were introduced in 1972 by a Ukrainian finswimming club and have been used for finswimming competitions since, allowing monofin swimmers to reach speeds of 12 km/h.
Monofins can be made of glass fiber, carbon fiber or aluminum and rubber. The diver's muscle power, swimming style, and the type of aquatic activity the monofin is used for determines the choice of size, stiffness, and materials.
Most monofins comprise a single, wide, glass or carbon fiber reinforced composite blade with graded flexibility attached to the diver by two rubber foot pockets. The leading edge may be thickened and faired. The blade flexibility is generally controlled by tapering the amount of fibre and thickness of the blade to make the trailing edge thinner and more flexible.
The Lunocet is a later type of monofin which uses bio-mimicry of dolphin flukes in an attempt to improve efficiency. It uses cycling shoes to connect to the diver for comfortable wear and power transfer. 
- Good monofin technique with the Lunocet
- Rick Waldock: Monofin - freediving in Bonaire
- Monofin Manufacturers
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