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is overheating/dehydration not essentially the same thing, as while feeling too hot might not be pleasant, I've not heard of that actually inhibiting performance (obviously the resulting sweating and dehydration does) but would be interested in seeing evidence that it does!
A fair point about sight being a bit more important for bunch racing/the track in general though! I suspect sometimes slightly dodgy sight isn't a hindrance to time trialling based on the danger and ridiculous kit people (including me) are prepared to try to eek out a few extra seconds...
Sainsburys_Ed
It all depends I suppose. In theory you are correct.
Indoor tracks can be incredibly hot and airless. Outdoors can also be hot too, when you spend all day sitting in the sun and warming up/down on the rollers.
Longest I am ever on the track for is probably 30- 35 mins, which is enough time to overheat for me (have got into the habit of wearing long sleeved baselayer under my skin suit and heavy gloves due to various crashes). The bottle/bike example you give is concerns dehydration, not overheating, no?
It's also a sweat thing -not much point being aero if you can't see where the wheels are in a bunch because your eyes are full of sweat.
Obviously for special events indoors you just want to be as slippery as possible, especially a match sprint, or 200m TT. However, being able to take the ear farings off will be useful for bunch races - I always feel a bit cut off when my ears are covered.