The Rocket Science One Sleeveless Triathlon wetsuit is an entry-level wetsuit featuring a comfortable neckline as well as ankle and wrist openings designed to keep water out but come off easily in T1. Shoulder flexibility is not sacrificed at all while the 3mm thickness in the core and upper legs keeps the body in a natural swimming position. The Rocket Science One Sleeveless One Triathlon wetsuit is appropriate for short or long-distance swims and is flexible for whatever swim stroke you choose.