Tie Dyed Shop Rainbow Spiral Pullover Tie Dye Sweatshirt 100% heavy weight cotton and pre-shrunk; satisfaction guaranteed. Will last a long time with cold water washings. We use pdf (cotton) stitching which absorbs the dye also. Some dyers use cheaper lightweight blanks with nylon stitching which does not absorb the dye. This item is frequently purchased for personal use and as a gift. Extended sizes available.