Morning all. It may be a long shot and your help is greatly appreciated. I have a pair of muck and buck boots. Both very similar to each other. The tread, sides, toe etc are all fine, lots of life left. It's the heel on the inside that has rubbed away, making them impossible to wear for any length of time. The inside is like a neoprene. Is there a repare or place to send them. It seems a shame to throw them.