worked all day Saturday in 95 deg., no clouds, no breeze. spent most of the day inside an empty 8 ft deep hole and the rest of the day kneeling on concrete leaning over the hole. the concrete was quite hot, but pulling wrinkles out of the vinyl liner in the empty pool was unbearable. I was just as wet from sweating as if I had been swimming. you know it's hot when you can pour sweat out of your shoes and have to wring out your money before handing it to the store cashier.