What types of clothing should I wear?

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Depending on the time of year and day, temperatures will vary. Since you will be in a harness for the flight, in most cases you can fly in short sleeves and shorts. The temperature drop at release altitude in relation to launch can vary 2-7 degrees Celsius. So on a hot 30 degree day the temperature when you release will be 23-28 degrees. Keep in mind that you will be traveling through the air at 40-60Kmh which will also cool you off. In spring (April-May) or early fall (September-October) bring along a long sleeve shirt and pants and maybe a light jacket just in case.