Build Up

Got one leg shorter than the other? Get your shoe built up and enjoy walking straighter. Any shoe can be raised. The best ones are running shoes. They have a natural curve to the sole which gets you walking easily. Flat shoes like skate shoes are a bit clompy once built up as they have no natural roll and the build up makes them stiffer.

Raise/build Colours available: Brown, Beige, Grey, White, Black.

Heel only won't work for most shoes past about 15mm. 

Yes we need measurements. 
Most people get less built up, than the difference between their legs.The real difference might be 25mm and they would get a 20mm shoe raise. Especially when someone has worn normal shoes for years. The change to exact measurements can feel uncomfortable.
While we can build up any shoe. The most comfortable are running shoes, as they have a nice rolling action to start with rather than a flat sole. Flat soles are less suitable as once they have a build up added they are stiffer. Which makes them clompy and don't roll nicely as you walk.
Also heel width needs to be reasonable to the height added. Adding 50mm to a stiletto is going to be unstable. 50mm to a running shoe is ok.