[quote=shortyfox]For the 21 you'll want a double. A continuous wire for each side might be preferable. Don't bother with an adjustable unless you are racing. Just get it how you like it and remember the "dog bone" gives you about 6 inches of adjustment anyway. A full back harness will be more comfortable for long periods. A "butt bucket" is easier to stow and will give your abs some work. Be sure it has a spreader bar instead of a buckle. If you can, try some different harnesses on first before deciding. They'll all feel different, kind of like buying shoes.[/quote]
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