The HALO Big Kids SleepSack provides the secure feeling your child needs to fall asleep fast and sleep soundly throughout the night. Generous sack design allows for kicking, but cannot be kicked off so your little one stays warm all night. foot openings for mobility when awake; room to tuck feet in at night use over regular sleepwear to take the place of loose blankets meets federal regulations for children's sleepwear sizes: 2t/3t fits 34-40 tall, 4t/5t fits 40-46 tall polyester washable imported