Use over regular sleepwear to take the place of loose blankets. 100% cotton interlock Size small fits 10-18 pounds size medium fits 16-24 pounds Size large fits 22-28 pounds size extra large fits 26-36 pounds Unzips from the bottom for easy diaper changes Generous sack design allows room for kicking, but cannot be kicked off so baby stays warm all night Sleeveless design reduces the risk of overheating Used by hundreds hospital nurseries nationwide as their product of choice for teaching parents safe sleep practices Embroidery reminds caregivers to place baby on his or her back Portion of every sale goes to First Candle/SIDS Alliance and The Canadian Foundation for the Study of Infant Deaths