The Marseille belt, made with flexible rubber, is widely considered the safest option for freediving. Its ability to adjust to the compression of a diver's suit at depth ensures that the buckle stays securely in place. Thanks to its small diameter holes and unique pin flicking mechanism, the likelihood of the buckle re-engaging is greatly reduced. Additionally, the roller buckle reliably releases when needed, but will not accidentally open when dragged against rough surfaces such as rocks or the gunnel of a boat.