Size: 4-5T The Sleep Onesie is designed to be worn on its own or with a Layer underneath for comfort. These are the perfect option for toddlers or preschoolers transitioning into a big bed, kids who kick off their blankets, or little ones who don't like the restriction of a sleeping bag. The 2.5 TOG Sleep Onesie is perfect for cool rooms (17-23°C / 63-73°F) Made & tilled with organic cotton Separate legs Super Stretchy Arms-out sleeping 1.0 TOG Sleeves Fold-over cutts Zip enclosure Three-way zip Machine washable chest across: 13" length: 37"