Bua recommend panel foams are replaced every 1000 hours of riding in order to ensure your horses back is looked after. The panel foams are available in standard, medium and maximum thickness. Alternatively, shims can be created and added by customer at a later date as necessary. 
 
Standard - Single foam 
Medium - Panel foam with extra full length shim
Maximum - Panel foam with extra full length shim and further half shim at the back of panel