The Woolino 4 Season Ultimate Baby Sleep Sack is a high-quality sleeping bag designed for babies between 6-18 months old. Made with a blend of organic cotton and merino wool, this sleep sack provides warmth and comfort throughout all seasons. The blue color adds a cute and charming touch to the nursery bedding, making it an essential and stylish addition to any baby's sleeping routine. The Woolino brand ensures a trusted and reliable product that will keep your little one cozy and snug while they sleep.