The E-Vento boots from Veredus are superb. After 11 minutes of cross country at Luhmuhlen in the CCI4* they boots hadn’t moved, flipped or marked Derby, and that included four water jumps. They are super boots and come highly recommended. You can buy them on the Zebra Products website http://veredus-uk.shptron.com/c/new_e-vento
And there’s a great video on how to fit them here http://www.zebraproducts.co.uk/.