The ultra white seats are treated with a stain resistant coating. Such stain resistant chemicals frequently belong to a class of agents called poly- and perfluoroalkyl substances (PFASs) which have been associated with endocrine effects as well as links to cancers and other health disorders. Here is a link from the NIH website:http://ehp.niehs.nih.gov/1509934/
Not sure what exact chemical Tesla is getting for its white seats, but most likely whatever it is belongs to this class of substances.
Here's an interesting story in the NY Times about one example of these substances, which suggests how little effective regulatory structure there is to protect the public, and how companies are able to release new substances with little to no validation of their safety.http://www.nytimes.com/2016/01/10/magazine/the-lawyer-who-became-duponts-worst-nightmare.html?action=click&pgtype=Homepage®ion=CColumn&module=MostEmailed&version=Full&src=me&WT.nav=MostEmailed
They do look nice, but I for one won't be putting my family at potential risk of getting testicular and kidney cancers.