The Sleep Onesie is a TOG-rated sleep sack alternative, designed to be worn on its own during sleep or with a Layer/PJs underneath for warmth and comfort. These are the perfect option for toddlers or preschoolers transitioning into a big bed, sleepwalkers, kids who kick off their blankets, or little starfish who don't like the restriction of a sleep sack. The Sleep Onesie is made from and filled with GOTS certified organic cotton that is non-toxic and gentle on irritable skin. The stretchy material allows your little one to move freely and stay comfortable for sleep. The 3-way zip configuration is helpful for overnight diaper changes or toilet trips, and foot cuffs add extra warmth for little toes. The Sleep Onesie 2.5 TOG is perfect as a winter onesie, as it will keep babies and kids cosy during sleep in room temperatures of 63-73°F. The TOG rating means there is no need for additional blankets in the cot when using this product, making it a safe-sleep option. For older toddler and preschoolers who are 'blanket-training' in a big bed, the TOG rating will help keep them warm if they kick the blankets off during sleep. If using a 2.5 TOG or 3.5 TOG for blanket training, we suggest a light blanket on top to prevent overheating. Parents can follow the FREE room thermometer and What to Wear guide provided with the product, to layer appropriately underneath to keep their child warm.