Correction: the original 70d tpu fabric I bought some years ago was from SeattleFabrics, not extremtextil. As others so rightly say, their customer service is diabolically bad, to the point where I expunged the transaction from my memory and assumed that I had bought it from ExtremTextil instead. Despite that I have some samples from them now. The 70d is 226gsm with a thick airtight coating, the 430d 260gsm with a thin coating that needs testing and the 30d 102gsm.