We SHIP FAST! Same day or next business day! 65% cotton 35% poly there is no such thing as a standard fit/size between brands. measure something that you have now and match it to a size of these to make your buying experience nice and easy! sizes are measured across the front lying flat, un-stretched and are approximate inches 3X = 31.5” Armpit to Armpit 4X = 33.5 5X = 35"