BabyStudio onesies are made from 95% organic Bamboo fiber and 5% spandex material to ensure safe and premium softness for your little ones. Our fabric has been tested and certified as Standard 100 by the Oeko-Tex testing institute. Short sleeve body suits are equipped with lapped shoulders and press studs crotch closure for ease of wearing.BabyStudio onesies come in classic colors perfect for starter wardrobes.