Buoyancy Compensator Device (BCDs) There are many BCDs on the market, each created for their unique specialty as well as the unique special owner. Some are created for travel which are light weight with basic features yet are durable. Some create lift by inflating as a jacket around the person while others have an inflatable bladder in the back in the shape of a ring or wings. The back inflated BCDs aid in keeping one horizontal, and produce less of a squeeze feel on the body when being inflated. Some prefer the jacket style because they believe the back inflated BCDs make it a bit challenging to float on your back while on the surface. Entry and some mid-level BCD's typically have plastic D-Ring attachment clips while others have steel. Multiple D-Rings are an advantage for finding that perfect place to connect your flashlight, gauges, slate or other item you feel must do down with you. Another thing to note is even though the right size is important, one should also take in consideration the Lift factor of a BCD. Typically this isn't an issue but if your diving cold water in a 7mm Farmer John suit, with a steel tank or dual tank rig then extra lift (ie more than 30#s) may be necessary. And finally there is the fit, feel and fashion aspect. It needs to fit right, feel good, and if you're going to be the subject in the next DiverActive Underwater adventure film, then you've got to look good too.