A canted footbed doesn't really make sense. If something is canted inside the boot it would encourage your foot to pronate and "mis-align" your Tiba, or inside of the ankle bone (posterior), with shape of the boot liner. The affect would be discomfort in the ankle area (which may or may not be fixed with heat molding the liner) and altering the axis on which the boot was created to flex on.
Canting outside of the boot, i.e. on your bindings, is where any canting modifications should take place. This way you are aligning the entire boot and foot with the leg...and not just the lower foot with nothing else.
The canted footbed might not make sense to you but I can tell you after riding with the Shred Soles for a weekend I am a believer. It is a very noticeable difference, in fact I ditched the heel wedges I had in my boots for the last two seasons and was in bliss.
Seriously, my feet felt so much better after a day of riding and my stance on the board is definitely improved.
I skate and snowboard and by far these are the best insoles. They are more like a custom orthotic you would get from the doctor. You inject water and it takes the exact shape of the foot. Super stoked on these! www.fpinsoles.com
this is the best money can buy. he treats tennis players (the little cripple Agassi is an ex-client), top skiers and soccer stars. if you live in states or canada i'm sure he can recommend a good counterpart he has there
IMO, the best out of box insoles for me have been the blue Sole insoles. My wife got me the shred soles for xmas and I'm highly disappointed with them. I should have returned them but I'm lazy like that so they have gone to waste. They have no arch support at all and really cause more foot pain for me than stock insoles. I really wanted to like the shred soles being they are local md/va/dc company but I just don't, they don't work for me. That said, I have a friend that is a podiatrist and he will be making my next insoles. He said don't "f" around with anything not made by a Dr. so I gotta give that a try next season.
Just going through a few different insoles. Remind medics. Shred soles. FP game changers.
The FP game changers would be my hands down choice. Quality is great. Support is good. Moldability is good. Cushion is good.
The medics is a second choice. Not as supportive. But cushioning is good
The shred soles honestly don't make sense. canting your foot within a boot made to keep you leg straight up and down. The support was OK. Cushion is crap except the canted side. The whole boot needs to be canted.