If you are doing a long run and it is hot out (>85F) and very little shade, is it better to wear a full white cap or just wear a visor? In the military, you were always taught to cover your grape when in the sun. But a cover would obviously hold in some heat. What is the current thinking on this issue?
Disclosure - I still wear a light weight runner’s hat with the mesh on the sides, under the conditions described above. Similar to this one http://www.roadrunnersports.com/rrs/products/ASW1133/