for 3 gun matches in July - Sept, I throw two of the hygroscopic gel neck wraps in the cooler... I can wear one while the other is absorbing water...helps bring the core temp down...this time of the year proper clothing aids evaporative cooling with the physical uptake of water..I gave up on cotton 10 years ago... the synthetic wicking fibers work exceptionally well in our heat and humidity... match Sunday was 94F with a 105 heat index...long sleeved (Dupont Supplex feels like cotton) nylon open cape backed flats fishing shirts....nylon heavy duty shorts....Dorfman Pacific open weave crown, wide brimmed hat, poly wicking socks...BullFrog high SPF lotion....drink alternating Gatoraid and water... monitor urine output for color ....wear a 2L CamelBak when working as range officer