Increase your vitamin D from the sun by wearing a tan-through instead of standard shirt

Standard shirts block virtually all ultraviolet radiation from the sun.
Tan-through shirts permit some UVA (tan) and UVB (vitamin D) radiation to get to the skin
Tan-through shirt appears to have an equivalent SPF = 2 in UVB spectra
Thus, the skin covered by a tan-thru shirt generates about 1/2 of the vitamin D than that of skin directly exposed to the sun

Image Image

If you want to generate the same amount of vitamin D and have less UVB on each square inch on skin you can expose more skin to the UVB.

Maximizing the UVB/UVA ratio appears to
    Reduce the damage to the skin
    Increase the amount of vitamin D generated
UVB/UVA is maximized at solar noon +- 2 hours.

I (Henry Lahore, admin of VitaminDWiki) purchased a tan-through T shirt July 2013
Update March 2015 - own several "vitamin D" shirts

There are several companies making that type of shirt
I happened to buy mine from: http://www.tanthrough.com/index.htm

Relative number of minutes in sun

  • 45 minutes long sleeved shirt +pants (11% skin)
  • 20 minutes T shirt + pants (25% skin)
  • 14 minutes T shirt + shorts (35% skin)
  • 13 minutes Tan-through T shirt + pants (38% skin) = 25% + (26% trunk X 50% shirt)
       tan-through T shirt provides about as much vitamin D as wearing shorts
  • 10 minutes no shirt + pants (50% skin)
  • 7 minutes no shirt,+ shorts (88% skin)

What I normally wear in the summer when mowing the lawn, shopping: Tan-thru T shirt + shorts = 75% skin

Note: The above does not indicate IU of vitamin D as the amount of time also varies with:

  • latitude
  • standing up/lying down
  • season,
  • skin color

Of course, not wearing a shirt is often socially unacceptable for

  • seniors, and many adults
  • obese
  • women
  • Golfing, playing baseball, gardening, walking in a park, bicycling, hiking, jogging, picnicking, etc.

Also, a tan-through shirt should keep you somewhat warmer in cooler temperatures.


Note: A standard T shirt has about 1/100 UVB vs tan-through has 1/2 UVB


Update June 2014 - bought a poloshirt which is tan thru

From their literature.
Microsol fabric which is a gas infused polymer with 2X the surface area of standard fabric - allowing more wicking moisture
lets more of the tanning rays and less of the burning rays to pass thru

Found a 2008 patent application http://www.google.com/patents/WO2008129278A2?cl=en which specifically mentions use for burka. Apparently a patent was not awarded.

Many companies have tan-thru fabric on Alibaba

Perhaps I will get around to making a superman logo which I can occastionally attache to the shirt

Image Image

See also VitaminDWiki

Short url = http://is.gd/dtshirt

List of attached files
ID Name desc uploaded Size Downloads Actions
4080 jpg Super D4.jpg 26 June, 2014 by admin 23.11 Kb 6667 View Download  
4079 jpg Super D1.jpg 26 June, 2014 by admin 11.66 Kb 4075 View Download  
2753 jpg Cooltan.jpg 08 July, 2013 by admin 39.68 Kb 4823 View Download  
2752 jpg Sun.jpg 08 July, 2013 by admin 39.78 Kb 4411 View Download  
2738 jpg tan-through shirts.jpg 07 July, 2013 by admin 64.51 Kb 5532 View Download  
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