I love HALO SleepSacks. We've used them for years. My daughter turned 3 and I tried to encourage her to stop wearing one (easier for going potty, etc.), but she is attached. I thought maybe she would outgrow it and stop wearing one because it wasn't comfortable anymore. Nope. After about a year and a half of use she finally wore holes in the bottom of her 18-24 month SleepSack. As they do not make the regular blanket style for bigger kids I thought I would try one with feet. BUT . . . they only come in polyester. Why??? In less than one month of wear and only a few washes it is all pilled up. The fabric looks worse and more worn than the cotton SleepSack she wore for at least a year and a half. So frustrating! I'm sure companies save money making cheaper clothing and products with polyester versus 100% cotton, but it does not wear well, is worse for the environment, and frankly isn't half as soft and comfy as well worn cotton.
That said, the fleece SleepSacks are good and warm. Cotton won't cut it with a baby/toddler in winter. Just wish they would have used 100% cotton on these like their blanket sleepers for younger kids.