This is what I wear when it's above 90:
http://www.icebreaker.com/site/icebr...aero_tank.html
Really, I wear this when it's above 75, but I find that when it's really, really hot this works the best for me. It feels so much lighter than any of my poly stuff and way better than the cotton stuff. Icebreaker has buried the link to the really light stuff as they're pushing their fall line right now, but you can still order it.




Bottom line, if you have a summer weight wool t or jersey, give it a try. Maybe wear it for a short run or some other endeavor where you won't be super far from home when you discover that it's not for you?!
Or, maybe wear it riding, but carry a regular summer jersery in a back pocket so that you can change if you need to?
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