I use fiber reactive dyes, soda ash, and urea for my dying. The human shirts are 100% cotton. I order the 5x Big Man Shirt from Dharma because it was a hard size to find and a good quality and price. I started tie dying and found that I could not find products in the area where I live, and believe me I shopped in every store. I don't usually order on line, but I found your company to be very helpful and convenient. The animal shirt I sewed with McCalls Pattern MP290, and used Dharma supplies to dye.