This is a 5-piece set of cotton rompers and coveralls for newborns. My baby, who was born at 4 kg, quickly outgrew them, so they weren't used very often, but the vest shows some pilling from washing. Set includes: short-sleeved undershirt, front-button bodysuit, short-sleeved romper, long-sleeved romper, and vest. All are 100% cotton.