What's up with the heel on 5.10 climbing shoes?

What's up with the heel on 5.10 climbing shoes?

Callum Teel's picture
By Callum Teel | Jul 20th 2015 |
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The heel section on 5.10 climbing shoes seems really different to other shoe brands and looks really uncomfortable! I've not tried any on yet but would love to know peoples experiences with them.

Thanks!