Must admit I have ridden Northern Australia . . Well all over Australia in high temps (high 30's and low 40's) and used leather pants with a mesh Summer jacket and not been too hot ever . . Well at least while riding . . Found if stopping for more then a fuel throw . . Jacket came off and if adding lunch n loo stop, leather pants came off . . Light shorts/bathers worn under leathers . . But a cooling vest at a reasonable price would be worth trying as I get to 70 . . .