Spiral tie dye on a 4X Premium Dancing Robin ringspun cotton t-shirt soaked in soda ash solution prior to dyeing with Procion dyes. Feel free to ask me any questions you may have. Wash with like colors in cold water for the first few washes. (*note about Dancing Robin Shirts: These have become my favorite shirts to dye! They run a little large, at first because they haven't been preshrunk. So they will shrink a little to the right size after a few washes.)