With all the safety benefits of a HALO SleepSack, it also includes convertible foot openings that can be flipped over to keep little toes toasty. Younger sizes, 12 month and 2T, feature an inverted zipper for easy diaper changes while the 3T size includes a standard zipper providing more freedom for older toddlers. Made with premium fabric without any added chemicals, the HALO SleepSack Toddler is available in 100% cotton and ultra plush Luxe fleece. 100% cotton TOG: 0.5 Continuing the trusted bedtime routine, SleepSack Toddler is your child's next step in safe sleep. Worn over pajamas, this wearable blanket safely comforts your little one all night long and can't be kicked off in the crib. Each feature is thoughtfully designed to accommodate for a full year of growth.