Woolino infant sleep sacks keep your baby safe and comfortable throughout the night. They are made with merino wool because it keeps your little one at a comfortable temperature throughout the night. This swaddle sleeping bag will help your bundle of joy to stay at the perfect body temperature necessary for a good sleep. Best yet, these wearable blankets are easy to get on and off your little one, so nighttime diaper changes will be easy. It's a sleeping bag for children that you can use throughout the year to wrap up your infant in comfort.