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Interestingly enough, I felt the upper of the SP is more breathable than the standard version. The layers on the fly mesh version seem to be thicker and I felt a noticeable difference in temp compared to the fly knit racers (to be expected). The SP, however, didn’t overheat and definitely isn’t...

Received my SP's today and they definitely run small. I wear an 8 in the flyknit racers (snug fit) and an 8.5 in the SP's fit perfectly. I returned the crimson zoom fly's in 8 because the heel counters were a bit too stiff, however, I would say that the SP's in 8.5 fit similar to the zoom fly...