Flex pads soft (yellow) and Flex pads firm (red) are ideal if you need the boot to fit tighter, or your horse's sole or frog needs more stimulation to become stronger. They are useful if your horse needs extra protection on hard rocky ground, or you're rehabilitating after founder, abscess, white line disease or thin sole. They are 5.5mm thick The pad will mould into the sole and the inside of the Flex Boot. Price per pair.