Soft and Warm - Yoofoss baby sleep sacks made with 2 layers, 100% cotton fabric and fleece lining, super soft and smooth, create warmth and cozy embrace for baby. Fleece sleep sack 1.5 Tog is suiable for moderate temperatures from 69 to 73°F as an ideal option for autumn, early winter and spring or taking a nap in air-conditioned rooms during the summer. | Healthy Development - Plush dots lining can lull baby fall asleep quickly, transform fleece sleep sack into an invaluable ally for moms and soothing your precious one. Moreover, our baby sleeping sack provides ample room for kicking freely, keeping baby comfortable all night and healthy hip development. | Hidden 2-way Zipper - Toddler sleep sack with zipper protection avoids scratching delicate skin of infants. Double zippers allow for effortless dressing and making nighttime changes easier. High-grade zippers of sleep sacks for baby glide smoothly without getting stuck, easily open and close. | Safety Sleep - Yoofoss baby sleep sack is certified to meet Consumer Product Safety Commission (CPSC), dedicating to ensure newborn's safety and coziness. Sleeveless design provides flexibility and snugness, while better regulates baby's temperature. | Warm Tips - Fleece baby Wearable Blanket come with 2 pack and machine washable. There are 4 sizes available for your choices: S(0-6 Months/10-18lb), M (6-12 Months/16-24lb), L(12-18 Months/22-18lb), XL(18-24 Months/26-34lbs). Please refer to our size chart carefully before you order our baby wearable blanket.