Just to add...
Of course keeping hydrated is always important, especially when you sweat a lot.
That being said if your vents are open and much wind is passing through, around, your body, you might not even need to sweat because wind dissipates heat very fast.
The purpose of cooling and venting is to allow your body to dissipate the heat.
Mesh panels and vents opening are there for a reason. Those engineers working on the development of summer riding gear certainly know a little about the physics of heat dissipation.
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