Asperities in boots
A pilot recently broke his tibia while ground handling. A significant contributory factor was that he had a ~30mm thick roll of thermal trousers within the shaft of his well laced up flying boot.
This roll caused an asperity, about which the tibia failed.
Do not have any asperities within your flying boots. Think like you would with ski boots and keep your socks pulled up and your thermals outside.