Fins

Swimfins, swim fins, fins or flippers are finlike rubber or plastic shoes worn over the foot to aid movement through the water in water sports activities such as swimming, bodyboarding, bodysurfing, kneeboarding, and various types of underwater diving.

Scuba divers use fins to move through water efficiently, as human feet provide relatively poor thrust, especially when the diver is carrying equipment that increases drag in the water. Very long fins and monofins are used by freedivers as a means of underwater propulsion that does not require high frequency leg movement.

Swimfins are also known as "flippers", due to the ambiguity of the word "fin"; "fin" can reference the fins on cars and auxiliary airfoils on aircraft. Scuba divers all around the world would generally be familiar with the word "fins".