Specifically designed for use with rebreathers with back-mounted counterlungs requiring more lift and a wider profile. This wing is based on the proven Evolve design while incorporating unique changes to facilitate comfort and functionality. Opening through center of wing for better hose routing Off-center corrugated hose for better ergonomics Thinner profile at top of wing for better spacing of Loop and hoses behind head Wider profile to not interrupt counterlung function Elastic retainer for counterlung over-pressure valveThe Halcyon buoyancy compensator is designed to meet the demands of any diving environment. Carefully tailored shapes support reduced drag and greater in-water efficiency across our entire line of buoyancy compensators. Moreover, you can rely upon Halcyon quality to support any environment you want to explore. Careful attention to detail, together with a long history as extremely active explorers have culminated in designs of rugged functionality.All Halcyon BCs include:1000 count Cordura outer shell allows the superior abrasion resistanceUrethane coated, 400-denier nylon inner bladder for puncture resistance without stiffnessHalcyon inner bladders are RF welded with a lifetime warranty on all seams22” Preferred length LP hoseOEM inflator with corrugated hoseCorrugated hose strain relief to reduce stress on the inflation connectionsHeavy duty zipper to allow easy access, if needed, to the inner bladderRapid water drainage via SS grommet holes or Texteline mesh