They pull your foot firmly into the foot-pocket of the fins and eliminate any wobble, so all your effort goes into forward propulsion. And, of course, you never lose a dive because a strap broke.
Mares makes stainless-steel spring-straps as an optional extra for all its open-heel fins, and now it offers the alternative of ready-made elastic bungee straps too. These work in exactly the same way, but are less weighty and have greater elasticity.
They are also said to be impervious to the effects of sun and sea-salt, rendering post-dive freshwater rinsing of fins so fitted near-pointless.
They are simply substituted for the original Mares straps (of which I never was a great fan) and offer a smooth solution similar to metal, but without the perceived hazard of ensnarement in any monofilament line that might be floating about or tangled on a wreck.
They are easy to pull on and off by the loops provided, and I detected no sign that these loops might soon break while I was using them, but only time will tell.
They have an ergonomic heel pad. Available in three sizes, they also come supplied with an extension piece that allows them to encompass a pair of Rock-boots, should you swap from ordinary neoprene wetsuit boots.
I added them to a pair of Mares Raptor fins. These relatively lightweight split-fins are not obviously popular in the UK diving market, so I let an Irish diver try a pair when they were first introduced, with a quick swim around the Rosalie Moller wreck in the Red Sea, and he came back to pronounce them “mighty”! Now they are even mightier.

SPECS
PRICE £24
SIZES 3
CONTACT www.mares.com
DIVER GUIDE width=100% width=100% width=100% width=100% width=100% width=100% width=100% width=100% width=100% width=100%