The Halcyon Eclipse buoyancy compensator is establishing a new standard for single-tank diving, while creating unprecedented streamlining, and eliminating the many useless “features” that clutter traditional buoyancy compensators. The Eclipse wing has a long, narrow profile that supports the diver’s 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 — these changes result in less effort and more diving fun.