Aqua Lung RK3 FinsDesigned in collaboration with the US military and renowned for outstanding performance and reliability, the Apeks RK3 is a rugged thermoplastic rubber fin featuring an over sized foot pocket to accommodate drysuit boots and a spring strap for easy donning and doffing. The design has been the standard gear issue fin for military, special ops, coast guard and public safety divers for decades. Traditional all rubber design. Short wide blade provides