There's a reason why Orca's Sonar has been top in its class of mid-range wetsuits for over five years. If you're serious about open-water swimming and want a step-up from an entry-level wetsuit, the Sonar is your answer. Its 4mm Aerodome neoprene panels contain hundreds of air cavities, providing over 30% greater buoyancy than standard equivalents. The Aerodome core stability panel covers the core area and the small of the back. Together, these panels lift the torso and core into the best possible swim position, lessening drag and improving stability. A 4mm hydrolift body panel adds even greater buoyancy. Extra panels in the shoulder and arm areas, and the multi-stretch inner lining enhance flexibility and range of movement.