100% Pima Knit Cotton. With a nod to the sea or baseball, depending on your sensibility, this is the sportiest romper in our boys collection. Knit from long-lasting Pima cotton, a little one will outgrow this special romper before the fabric shows any signs of wear. And the cotton is silky smooth inside and out, providing special softness to the baby's delicate skin as well as everybody whose lucky enough to cuddle him. (Interlock is a knitting technique that sandwiches 2 layers of jersey and results in a smooth surface on both sides, inside and out.) Snaps are at the shoulder and along the inseam for easy dressing.