SAFE AND COZY DESIGN- 1 pre-washed sleep sack; wearable blankets create a safe sleeping environment for your baby, eliminating the danger of loose blankets; TOG rating 1.10 SOFT AND BREATHABLE- Made with two layers of lightweight and ultra-soft 100% cotton muslin, it is exceptionally breathable for optimal airflow, reducing your baby's risk of overheating and ensuring comfortable sleep; Sleeveless design reduces the risk of overheating BABY FRIENDLY- Unzips from the bottom for easy diaper changes. Generous sack design allows room for kicking, but cannot be kicked off so baby stays warm all night PREMIUM- muslin fabric is ultra-soft and features a durable weave; it gets softer and maintains its original shape with each wash and wear; Use over regular sleepwear to take the place of loose blankets Available here in Large size designed for babies weighing between 22 and 28 pounds who are generally 12-18 months old and 30-35 inches long