I give this sleep sack to everyone have a baby . we get it as a gift when we daughter be bear and it be one of the baby item I could not live without ! with the velcro strap , swaddle the baby could not be easier . this be a huge plus for a squirmy baby , particularly in the middle of the night when you want to get back to sleep , not spend 5 minute try to swaddle a squirm baby . another great thing about it be that you can remove the swaddle wrap . this be good if the a baby decide they do not like be swaddle , you can just have the sleep sack and if they outgrow the sack part , or the season change and you want they in less layer but they still want to be swaddle , you can use the swaddle wrap on its own . I also like the fact that the zipper zip from top to bottom , so the zipper pull be not up at the baby 's face . a MUST HAVE !!!!!!