we use these for we first child who do not like to be swaddle . now with we second , we be try to figure out how to use they but still swaddle she -lrb- she be too big for the Halo sleep sak swaddler -rrb- . what we have be do be put a light long sleeve onsie on she then the sleep sak then the swaddler and it work great and she have not be get too warm -lrb- we be use the cotton sleep sak .