Tie Dyed Shop Rainbow Shamrock St Patricks Day Tie Dye Shirts Small to 5X 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 cotton stitching which absorbs the dye (not nylon stitching). Adult sizes small to 5X are normally in stock.