I always try to research the materials and labor issues and so far I've unearthed this on their FAQ:
"not mass produced...each style is professionally handcrafted locally in small batches"
I'm not sure where locally is or what the labor conditions are specifically but that sounds promising. They also mention strict quality control -- so appreciated. I try to buy for quality (and thus longevity) to be sustainable. Not sure about the materials though, in terms of composition/waste, although we know it's vegan.
*The whole site is in flash, otherwise I would have linked you to their FAQs. In fact you can't copy/paste any of their text or images which means I had to write down the language on manufacturing and retype it. I have no idea why a business would build a site that is virtually not share-able?