Two pieces, plenty of room to wiggle. Gerber's Tight-Fit Pajama Set is made from 91% viscose made from bamboo and 9% spandex for a soft, smooth feel with flexible stretch. The long-sleeve top has raglan sleeves for easy movement. Matching pants pair a foldover waistband with a Grow Cuff to help extend the fit. Machine washable. Sizes 12M, 18M, 2T, 3T, 4T and 5T.