In the 200 weight there are two options from Icebreaker that come close to matching your description although none of these options are spot on. First, there is the Bodyfit 200 series however this is only offered in Black, Loden, and Thunder (or black, green and blue) and not any type of "natural" or light color. This is the same case for the Spring 2009 product going forward as well. Second, there is the GT220 (it is slightly heavier than the 200) and this is only offered in Black, Ink and Nickel (or black, navy and silver). Silver is the lightest color of the three, but it certainly is not "natural" or white. If you look into lighter weight merinos there are a few options for "undershirts" in a 150 weight. It is part of Icebreaker's "Nature and the Beast" line. In this line there are several options that come in a Bone color way (which may be the natural color you are referring to). Check out this SKU on Backcountry.com and see if this is more in line of what you are looking for: ICE0293. (You can type this SKU in the search bar). Hope this helps!