Originally Posted by
rsbob
I buy from an Australian company, NeoPro, which advertises its jerseys as SPF 30. I have noticed they do feel warmer, but they do have a nice mesh under the pits extending down the sides. For me part of the warm factor is how well/tight they fit.
Tighter is better.
Loose fitting leaves an air gap that acts like an insulator.
The pit mesh and a few other tactics helps mitigate the lower cooling rate, but we just have to deal with it.
As with all engineering, compromise is required.