Sunglass position when leaving T1
I'm curious what folks do with their sunglasses when they are just coming out of T1. In Florida, the humidity is quite high in the mornings and invariably the dry sunglasses I left on my helmet are covered in dew when I get to T1. I have to slide them down my nose and look over them for a mile or two before they clear up. If this happens to you, what is your strategy for dealing with the problem?
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I think them getting fogged up is more of a function of your body temp and the air temp/humidity outside.
First, don't let them get cold. If they are above the dew point you won't get dew. So warming them up slightly if coming out of a cold car, leaving so they have sun on them (if possible), those things will help. Obviously don't microwave them for heat. Maybe body heat before finishing transition set up.
My other thought would be to put them in a zip lock bag with dry air. Your air conditioned hotel room if comfortable, would have a relative humidity around 45% and a humidity level that corresponds with a dew point around 55. Seal the glasses in sandwich bag with that drier air. If you use outdoor air at the race course then it's the same air inside and out, wouldn't work. If you want to get really wild you could put desiccant inside the bag to further dry it out. Those are the salt pack looking things that come in new running shoes. To speed up transition I'd suggest tapping the bag to the bike, maybe top tube or aero bars. Then you take out your dry glasses and put them on. Put the baggie in a pocket.
If the glasses are cold coming out of the bag, and outside air is still cold and humid then you could encounter the same issue with fogging. Presumably though the air is close to saturation (dew is forming on everyday things, not just lemonade glasses) at transition set up, swim beginning. However, as the sun comes up and time passes with swim waves I imagine you typically see a 5-10 degree increase in dry bulb (thermometer) temperature. That will make the air less saturated with water as it heats up and dew formation stops.
(What is happening is that air heats up it has the capacity to hold more water, so it is relatively more dry, from an absolute standpoint it still contains the same amount of water. Picture a sponge being squeezed at the sink. You squeeze, it's glistening, it looks wet. You release the squeeze, it now looks dry but, contains the same amount of water. Cold air is squeezed, warm air is not; to connect with the analogy.)
Hope this helps!
I only have to worry about sunglasses in T2 now.
However, it sounds as if your are for comfort and bug protection.
It seems to me that they would equilibrate with your body heat/humidity and get a chance to dry off if you somehow hooked them into your helmet like roadies do, but that may not be an option... but one way or another can you just "carry them near you" like hooked on a helmet for a few miles in some way? Or does your helmet fit in such a way that you can't really slip them on easily while riding?
If you don't mind burning 10 seconds there's nothing wrong with putting a lens cloth in a zip lock back and quickly drying them before donning them.
Also, if you seal them in a zip lock bag before the race (not just casually enclose them, but really seal the bag), you will have a closed system and no water will be able to condense on them while you are swimming outside of the very small amount of water in the air in the bag. That might be your best bet.