Increased buoyancy, reduced drag and most important of all, more speed! The ZONE3 Streamline Sleeveless Swimskin is the result of requests from Ironman athletes looking for extra core support and reduced drag during non-wetsuit swims. This entry-level Swimskin builds on the back of our our classic Swimskin, which was previously shortlisted in the Lava Magazine ‘Gear of the Year’ feature.