Parents, this Mosebears sleep sack is perfect for keeping your little one cozy and safe during colder months! It's a 2.5 TOG rating, which is ideal for room temperatures between 64°F and 71°F - basically most homes during winter. The sleeveless design is important because it helps prevent overheating while still keeping their core warm, and the attached feet keep their toes toasty too. It's made with an organic cotton outer that feels super soft against baby's skin, with polyester filling that provides warmth without being too bulky. The two-way zipper is brilliant - it unzips from the top for easy placement of your baby, and from the bottom for quick diaper changes without fully undressing them. There are even zipper protectors to prevent scratches on delicate skin. It comes in sizes from 6-18 months (for babies 28-34 inches) up to 3T-4T (38-42 inches), so you can use it through the toddler years. The sleep sack replaces loose blankets in the crib, which is much safer since blankets can pose suffocation risks for babies. It's like a wearable sleeping bag that surrounds them with warm air while allowing them to move their arms freely. For washing, they recommend hand washing or low-temperature machine wash and tumble dry to maintain the quality. Seriously, if you want your baby to sleep comfortably through cold nights without worrying about blankets, this sleep sack is a fantastic solution.