Review on Cressi EBS Fin Strap: Durable Elastic Bungee Pair for Fins - Official Spare Parts - Cressi: Trusted Italian Quality Since 1946 by Greg Moore

Cressi Information on choosing the right bracelet is almost non-existent. The Reaction/Frog Plus style is a male attachment. They should have a female end on the fins. The "Ara/Pro Light/Frog" style is a buckle with a female end on the strap and you need a male end on the fins. I mention this because I bought mine with a pair of Cressi Thor fins. The Cressi website recommended I buy the "Frog Plus" style to go with these fins. It was wrong. Just pass this information along to other Thor fin owners who want to switch to EBS straps without having to buy all new fins. They're great for this, just make sure you order the right ones!