Inserts and a heel lift potentially- would be in the offing but Marty and Josh are right making sure you get a non-riding pair of boots is so important. I Have a bit of a heel spur left over from a cycling accident and extra build up so I have to be careful which i choose.
You can do a bit with lacing techniques to lessen side slide and front back. I've gone with a hight calf cut to minimise the slide up and down on the backs of the heels on boots but your Soleus needs to be able to handle the squeeze they provide too.
Good socks that minimise sweat moisture build up creating a slick surface are worth their weight as are ultra thins inside a normal pair to act as wicking / drying layer Thin thorlo running socks work for me with this.
Speak to what works fro the boys out clambering the screeslopes they'll know in spades what also works.
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