The Halcyon Eclipse buoyancy compensator is establishing a new standard for single-tank diving while creating unprecedented streamlining and eliminating the many useless %u201Cfeatures%u201D that clutter traditional buoyancy compensators. The Eclipse wing has a long, narrow profile that supports the diver%u2019s single tank along his or her entire length, preventing unnecessary drag and minimizing in-water effort. Meanwhile, the infinitely adjustable harness prevents the frustrating lack of control found with typical buoyancy compensators. This added stability reduces drag by encouraging a streamlined position %u2014 these changes result in less effort and more diving fun.