Fleece and Cotton Imported Safe Sleep - Our baby sleep sack boasts a double-layer design, combining a 100% cotton lining with plush fleece fabric to deliver a gentle, skin-friendly touch for your baby's sensitive skin. Certified by the Consumer Product Safety Commission(CPSC), these baby sleeping bags ensure a secure and safe sleeping environment for your little one. Convenient 2-Way Zipper - Unnivoll winter baby sleep sack with premium smooth two-way zipper, parents can effortlessly change diapers during the night, ensuring uninterrupted sleep for your baby. What's more, the zipper protector at the top shields your baby's delicate chin from any zipper scratches. Your baby's comfort and safety are our top priorities! Roomy Spaces - The toddler fleece 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. Soothing Dots Design - The fleece sleep sack with raised dots resemble mom's touch, giving your baby a familiar sense of security and soothing baby to sleep through the night. Suitable for temperatures between 69-73°F (21-23°C), this 1.5 tog sleep sack creates a warm and cozy environment for your baby. Baby Essentials - The fleece baby wearable blanket come with 2 pack, can be machine washed and dried at low temperatures, which is convenient for the baby to change at any time. Four size options available for your choice: S(0-6 months), M(6-12 months), L(12-18 months), XL(18-24 months). Please measure your baby's height and weight and refer to our size chart carefully before choosing. Unnivoll Fleece Baby Sleep Sack