95% cotton 5% spandex Soft and stretchy Perfect worn alone or over a long sleeve shirt in colder weather. All measurements are approximate. Please allow for a slight difference. All measurements are taken laying flat and unstretched. The first measurement is from underarm to underarm while the second is the length from shoulder to the bottom of the dress. XS (12/18 months) 10.5”/18.75” S (2T) 11”/20.5” M (3T) 11.5”/21.25” L (4T) 12”/22” XL (5/6) 12.5”/23” 2XL (6/7) 13”/25” Please message me the size you would like shipped when purchasing.