5/3mm Men's Zone3 'Originals' Buoyancy Shorts We invented buoyancy shorts back in 2007 to help improve our swim technique in a natural an efficient way. The original product was made using a 5/3mm thickness smoothskin material but due to their overwhelming popularity, we have now released a more buoyant and lower drag focused design called 'The Premium Option'. Using 3mm Yamamoto #39 SCS on the front and back panels we have been able to produce a softer, lighter and more flexible fit, while the 5mm Aerodome side panels offer 30% more buoyancy than standard neoprene. Key Features: Highly buoyant design for heavy legged swimmers. 3mm Yamamoto #39 SCS front and back panels. 5mm Yamamoto SCS Aerodome side panels. SCS Nano coating for drag reduction. New comfort focused waistband Key Benefits: Improves your body position and swim technique. Enhanced core support to aid with technique development. Designed as a natural feeling alternative to a pull buoy. A softer, lighter and more flexible fit, that aids the swimmer with more buoyancy and hip rotation. 1yr Warranty