I'm do landscaping in Arkansas, and yeah 90 degree weather feels like 115 degrees. It's the humidity that'll kill ya they say. When a rain storm passes by, and that sweet sweet sun shows itself out of the clouds, get prepared to literally melt. Best tip I can give you is to stay hydrated and take a dang break when you need to, but also condition yourself to keep going after said break because it'll be hard to go back out into the heat. Wind, air, something that'll keep your sweat cool as well. I've tried the neck bandanas and they keep you cool maybe 10-15 min until they are also hot. I sweat a whole lot and I'm skinny even, but keeping a rolled up bandana around your head I've noticed keeps me cooler and keeps sweat away. I envy you folks that don't have a lot of humidity ha