Hudson Baby muslin long-sleeve sleeping bag, wearable blanket, sleep sack is a great bedtime blanket for your little one. Made with 100% cotton, our wearable blanket will keep your little one feeling cozy, comfortable and secure through the night. Our long-sleeve, lightweight sleep sack is optimal for keeping your little one warm and comfortable but preventing overheating. Our sleep sacks, wearable blankets and sleeping bags are always intended to be worn over children's sleepwear.