In 1950, long before technical diving was a concept, Cressi revolutionized scuba diving with the introduction of the vented RONDINE COMMANDO fins. These fins were originally designed for the U.S. Military Underwater Demolition Team (UDT) and saw extensive use in the 1960s. Today, the ORIGIN fins carry forward this historic legacy with a modern upgrade. The heavy-duty requirements of technical diving align perfectly with these durable, abrasion-resistant fins made from a single material. Staying true to the original designs and patents, they come either as neutral (LD) or negative (HD) rubber versions. The ORIGIN HD is a high-density material which is slightly negative, perfect for the use with drysuits and mid to heavy gear.