SAFETY COMES FIRST-Made of 100% cotton fabric and fluffy polyester filling, Unnivoll baby sleep sack is certified to meet Consumer Product Safety Commission (CPSC) guidelines, eliminate all potential risks and provide a safe sleeping environment for your little one.

Warm 2.5 TOG-with a 2.5 TOG rating, our sleep sacks meticulously designed for the cold seasons. Ideal for room temperatures ranging from 61-68°F. This exceptional baby wearable blanket is thoughtfully crafted to create a snug and inviting sanctuary for your little one.

EASY DIAPERING-2 way zipper runs from the top to the bottom, making the warm sleep sack much convenient to change diapers without any interruption, especially during midnight. Equipped with zipper guard prevent rubbing on your baby's sensitive skin and protects baby's chin.

Roomy Spaces - The 2.5 tog sleep sack offer ample room for kicking but can not be kicked off. This can promotes baby's healthy hip development, while the sleeveless design reduces the risk of overheating, ensures free arm movement, and provides lasting warmth for your little one.

ACCOMPANY BABY'S GROWTH-Four size options available for your choice, S(0-6 months/10-18 pounds), M(6-12 months/16-24 pounds), L(12-18 months/22-28 pounds), XL(18-24 months/26-34 pounds). Unnivoll sleep sack is essential for everyday use, keep your baby cozy and sleeping peacefully!