Here in the upper Midwest we will get into the 90’s just a few days but often we can have high humidity. I found that by using something like a Craft or Santini under layer really helps. Some are solid others are almost a fishnet looking weave. They really seem to help get the evaporation moving. Seems crazy to wear two layers in the 90’s. but it seems to work. I wear a race cut jersey with long zippers over this and will open the zip if I want to get air in.
Going light colored works best. That applies to helmets also. I wear Bell and have the Furio and the Ghisallo. All the marketing hype talks about vents…yada …yada…yada… Well the Ghisallo has just a few more vents and it is MUCH cooler. But you may need sunscreen on your head! I use the Furio for cooler weather riding now.
Cheers,
Dusk