Tie Dyed Shop Spiral Tie Dye T Shirt - Pink and Green Colors 100% heavy weight cotton (6.1 oz) and pre-shrunk. Men should normally order 1 size larger. Will last a long time with cold water washings. We use pdf (cotton) stitching which absorbs the dye also. Some vendors use lightweight shirts with nylon stitching which does not absorb the dye. Regular and plu sizes available.