Bought the new model recently and they initially felt comfortable when putting them on since they have a compression like sock. However, they caused blisters half way through the first round. Tried a week later with same results. Appears to be based on the positioning of the tiny heel cushions and some other recent reviews indicate similar issues. I’ve run countless ultra marathons and completed in six full distance triathlons, and never had a shoe cause blisters. They seem to be made with premium materials and certainly waterproof, but the blister issue renders them useless for me. Hope others have better luck.
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