My husband wore this during a half marathon and marathon. It was 90 degrees and 90% humidity for both races and he did not chafe at all. It was a little more fitted than he's use to, but I think that may be part of the reason why he didn't chafe.
Men'S Long Sleeve Polo Shirt - Slim Fit, Stretchy, Breathable Collar
43 Review
Van Heusen Traveler Stretch Men's Shirt
47 Review
Calvin Klein π Herringbone Sleeve Men's Dress Clothing
50 Review
Men'S Regular Fit Short-Sleeve Dress Shirts By Allsense - Look Stylish And Professional!
41 Review