Replacement shell for Flex Boots. If the shell of the boot is damaged for any reason, you can replace it with a new one.
The shell comes with two rivets (male and female) that are required to attach the TPU gaiter to the shell. The back of the shell also has an adhesive, that will be activated by heating with a hot air blower.
If you don't have the tools to change the shell, you may want to ask help from the saddle maker of a shoemaker.