I bought one pair of sums in order to try (based on the fact I liked the style and colour) I had a 24 hour ultra coming up so treated myself. When they arrived I instantly knew they were ‘the ones’ I wore them out on a run and came home and ordered two more pairs. I did 150 km in them over 24 hours and not a single blister, they are what I’d call the real deal 20/10
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