New Dreamland Dream heavy Sleep Sack in Black Sz M medium 6-12M. New with tags never used. Dream heavy Sleep Sack is designed to help your baby feel calm, fall asleep faster, and stay asleep longer. The sack features our exclusive CoverCalm Technology, evenly distributed weight from your baby’s shoulders to toes to naturally reduce stress and give your baby the feeling of security and comfort - just like a hug. This sleep sack is a 1.0 TOG, perfect for 68-73°F or 21-23°C