The buoyancy shorts were first developed by zone3 back in 2007 the original invention of this product was made using a 53mm thickness combination of smoothskin material but due to overwhelming demand zone3 have now released a less buoyant design called 39the next step39 these shorts are aimed at those athletes looking to further develop their technique and efficiency but don39t need as much core support the original buoyancy shorts were designed to allow swimmers to see the improve