Has anyone here ever tried these ?

M

mr.bacon

Member
I have and they are GREAT ! just saying in case anyone is in need of a good insole for skiing. I used them this past season and the impact protection is outstanding. and best of all is the price. chepest custom insole out there. made specific for skateboarding, but perform just as well for skiing !

I used the Gamechanger insole this winter and just bought me a pair of the Kingfoam custom orthopedics.

http://www.footprintinsoletechnology.com/kingfoaminsoles.htm

 
Those dont look like they could produce enough arch to be usefull in a ski boot.

Its also a misconception that a soft footbed will offer more cushioning from impact, however this is not actually the case.

There are 2 problems with a soft insole, 1 as it is soft it will compress and allow your foot to pronate on the bed itself, making the support less then ideal. The second is a strange concept to get your head around. The best way to think about it is this. If you had a pillow over your foot and someone hit it with a hammer, the hammer would go through the pillow and the impact would be felt on your foot. However if you put a piece of wood on your foot and that was hit with a hammer, the wood takes the impact and the force on your foot would be much less. The same works for footbeds. Firmer footbeds will actually take the impacts better then a soft footbed.

Hope this makes sense it can be hard to explain.
 
Okay, maybe the Kingfoam Custom Orthotics is not good enough for skiing. i see your point.BUT as I said, I have been skiing with the Footpring Gamechanger insole this past season, which is a Totally different insole. It's just like any other custom insole i've bought that is meant for skiing, but you do the molding of the arch yourself by injecting water in it. walk around for like 2 min then you have a supreme arch support. The difference beetween this and other custom sole is the price and the "kingfoam" layer underneat the heel and toe ball. It Absorbs 90% of all impact energy.

As I said i have been skiing with these, and it's nothing like any footbed. the suppert is really really good.

http://www.footprintinsoletechnology.com/gamechangers.htm

 
I did look at those, but there are still a few problems. The bigest being that unless you happen to be a podetrist, how can you possibly know how you want to mold it to properly support your foot.

Its not as simple as just filling the gap under the medial and lateral archs, its making sure that the archs are properly supported in a neutral stance when under load.

Thats the second problem, these insoles are made for skaters. The forces they put through there feet are not even close to that which skiers feet are under. Take for example a 30Mph corner on skis. The G force in that corner will put twice your body weight through your feet, so the footbed needs to be stiff enough to resist this. Now thats only 30Mph, as you ski faster this only increases. Skaters dont even get close to those kinds of speeds. Yes they have sudden hard impacts, but its not a sustained load like a turn in skiing.

Im sure they are great footbeds for there intended use of skating, but they certainly will not be as good as a well made skiing footbed, made by a profesional fitter.
 
Uh, a skier of mass ~80kg travelling at 30mph in a turn of 10m radius will experience roughly 2G of centripetal force, give or take a coupla hundred newtons.

Juuuuuust saying.
 
G-force (or Gs) is just the equivalent force of gravity on an object.

Force = Mass x Accelleration - The accelleration from gravity is a constant (9.81m/s although a lot of times you just use 10) so you multiply the mass (say 80kg) by 10 to get 1G for that person - so in this instance, 1G = 800 Newtons (N) of force.

In a turn, you're comparing the centripetal force (the force towards the centre of the arc, which is what lets you turn) to the equivalent gravity.

The equation for centripetal force equals (Mass x Velocity squared) divided by the radius

So if you're going 30mph ~= 13.4m/s, you weigh 80kg and you're going around a turn of radius 10 metres:

F = mv^2/R

F = 80 * (13.4*13.4) / 10

F = 1436.48 Newtons

The force of 1G on an 80kg rider is 800N so 1436N isn't that far off double that, AKA 2G

I mean we could work out all the crap like frictional losses and do vector diagrams but for the sake of the argument I thought this was sufficient:

Spark notes: Herp derp, algebraic.
 
A. weight makes no difference in how many Gs you will feel.

B. he said a skiier turning a corner at 30mph, not 30mph with a 10m radius, he implied that any turn a skier makes at 30mph will result in you experienceing 2Gs.

juuuuust saying.
 
Yeah I am no physicist, what I was trying to explain is that if you go through a corner at speed the force put through the arches of your feet will be more then if you were just standing still. We usally use the twice the weight for 30mph turns but it may be very wrong, but it gives you the information you need to know. ie when you ski faster you need a stiffer footbed.
 
@maxwell666 Weight/mass makes no difference in the amount of g's a person will feel, but it does affect how much those g's are equal to. A 500lb person in a 2g turn will have to cope with the weight of 1000lbs while a person weighing only 90 lbs in the same turn will only have to deal with 180lbs. So in order for a footbed to be effective for someone weighing 200lbs, it needs to be able to support itself even under weights in excess of 400 lbs (depending on how aggressively the person skis)
 
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