Safety Comes First - Made of 100% premium cotton layers and soft fleece filling to guarantee the utmost comfort and the protection of toddler's sensitive skin. Yoofoss baby sleep sack is certified to meet Consumer Product Safety Commission (CPSC), dedicating to ensure your baby's safety and coziness. | Warm 2.0 TOG - With a 2.0 TOG rating, our sleep sack meticulously designed for the cold seasons, such as autumn, winter and spring. Ideal for room temperatures ranging from 64-70® This exceptional wearable blanket for baby is thoughtfully crafted to create a snug and inviting sanctuary for your little one. | Widen Hem And Sleeveless Design - Spacious space is beneficial for kicking freely and healthy development of baby's hips. Sleeveless design of this sleepsack provides for greater flexibility and comfort, better regulates your baby's temperature and reduces the risk of over-heating. | High Quality Zipper with 2-Way - The double zipper allows for easy dressing and convenient diaper changing with no hussle and bustle. With top-grade zippers and a carefully designed neckline, the sleeping sack for baby frees from any potential scratches, glide along the tracks moothly without any snagging or jamming. | Available Size and Mahchine Washable - There are 4 sizes available sleep sacks for your choices; S for 0-6 Months. M for 6-12 Months. L for 12-18 Months. XL for 18-24 Months. Please measure your infant's height and weight, refer to the size chart before choosing. This baby sleeping sacks withstand multiple washes without fading, deforming, shrinking and reduce the household chores for parents.