Particulary for someone with fair skin? Or even wearing usual, normal clothes (cotton/polyester) shirt, et cetera, is it unlikely at all that UV Rays will pass through it and cause burning, or more likely during the hours of 10 AM – 3 PM and when the temperature is much hotter, say 25 degrees celcius or higher? If you buy a garment (particulary a long sleeve one with UPF Protection) won’t you get less Vitamin D intake? or will a short sleeve shirt (non UPF or UPF Protection) be fine, considering you use sun screen particulary between 10 AM – 3 PM and when the temperature is hotter? Is it really worth buying a shirt (garment) with UPF Protection, even though they are dearer/more expensive? http://columbia.com.au/flash/upf.cfm
UV radiation does go through normal clothing to some degree. Material that is lighter and has a loose weave will allow more radiation to penetrate. UPF protection clothing is really good if you a spending a lot of time in the sun. When normal clothing gets wet, more UV can get through so if you are planning to swim etc, get UPF shirt. I’ve got really really fair skin and I always wear UPF clothing when I go to the beach. I find that sunscreen doesn’t always protect me from burning (even with frequent application) whereas my sunshirts do. If you don’t want to spend the extra money on UPF clothing, apply sunscreen under your clothing. As for Vitamin D intake, you will receive plenty with every day activities…it’s only a problem with the elderly who don’t get out or in really cold countries where you don’t go outside much. Just remember that the temperature of the day isn’t always a good indication about the UV radiation risk. If you have fair skin, avoid excessive exposure between 9am and 4pm.

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