I wanted to love these shoes. I have a Mt Bike version of this shoe and it is great. Maybe it is my cleat design difference (LOOK vs Shimano) that causes the issue, but my feet still get hot and tired in these shoes. I love the ratchet design and durability and maybe it is just my sensitive feet, but it did not produce a cooler foot.
Living in the deep South of the US, I know hot weather, and this shoe is made to help keep your feet cool. Plenty of ventilation, but even with the knit construction they are very stiff and fit me similar to the Sidi shoes that I have used for years.