how have "jet" fins evolved since the 80s?

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tep

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Digging through the garage a few months ago, and came across my original 1980s (actually 1978 and 1980, I think) "jet fins". One pair from US Divers and one from Sub-Aquatic Systems.

Man, they look small. The foot pockets look tiny.

The US Divers are only 18" tip to pocket edge, the SAS are 19".

Are modern jet-style fins still this small, especially the foot pockets?

Tempted to throw some springs on these and try them out - the rubber/plastic/whatever is still in quite good shape.
 
https://www.shearwater.com/products/swift/

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