The TRANSITION shoe (grey) is the hardest shoe, suitable for hooves that require some extra support with the advantage of helping horses adjust when changing from metal shoes.
The JOINT SAVER shoe (orange) is a medium hardness shoe, softer in composition to relieve concussive related stress and strain. The shoe is particularly good for hard working horses at risk of joint complaints such as arthritis.
The MEDIC BLUE (blue) is the softest of the shoe grades. This shoe is suitable for most riding applications with the added benefit of being designed for therapeutic treatments. Laminitis and other common pathologies that require support whilst still allowing the hoof to function in a more natural way respond well to the medic blue.
It is recommended that you try the different grades until you find which one suits your horse and your activity.