As mentioned above, your hands (wrists mainly but also the back of your hands) are are critical cooling radiator. Using anti-perspirant will keep your entire body from being able to cool itself. Gloves, helmets, and leaning forward all prevent natural cooling. On any given day and ride I will be much cooler wearing jeans with no helmet or gloves and riding an upright bike than wearing lycra, gloves, and helmet on a drop bar road bike, hybrid, or mountain bike.