In this thread I want to report what I found out when conducting a little online research into Cressi sub's 1970 classic long-bladed fin, the Rondine-L. I also propose to write about three 2010 products of this all-rubber full-foot long-bladed fin technology. Exactly four decades have elapsed since Rondine-L fins appeared: 1970. Rondine L long fins – The world leader of molding rubber fins, Cressi developed the Rondine L long fins, which enabled Jacques Mayol to go onto achieve his astonishing free diving records. http://www.cressi.com/flash/History/HistoryDati.asp Here are three pictures of these fins: The first picture is from an Italian site offering the fins for sale in new in box condition at 30 euros: Pinne apnea cressi rondine l - Sports In vendita a Rondine-L fins have at least two reasons to be remembered in the annals of fin development: 1. They were used by the legendary depth-record-breaking freediver Jacques Mayol in his ascent from 100 metres: Jacques Mayol - Wikipedia, the free encyclopedia 2. They were the only fins in the world, then and since, to be manufactured in "personalised" sizes, e.g. "45", rather than a range of sizes, e.g. "44-46". They were developed for use in "skin diving and finned swimming, made in non-floating black rubber. They (were) available in sizes from 39 to 46." (Cressi-sub catalogue, circa 1970). I would be interested in hearing about anybody's experiences with Cressi sub's Rondine-L fins.