Anzai: Pure Cotton Simplicity for Better Sleep At Anzai, we believe that "less is more" when it comes to your baby's comfort. Our 1.0 TOG Double-Layer Cotton Sleep Sack is designed for parents who want a breathable, all-natural, and plastic-free wearable blanket. By using two layers of high-quality, OEKO-TEX certified cotton instead of synthetic padding, we've created a sleep bag that is exceptionally light and moisture-wicking. Size Guide & Measuring Tips (Important): To ensure the best fit and reduce the hassle of returns, please choose the size based on the length from your baby's shoulder to the bottom: Small (3-6 Months): 70 cm / 27.5 inches (Shoulder to Bottom) Medium (6-24 Months): 90 cm / 35.4 inches (Shoulder to Bottom) Large (24-36 Months): 110 cm / 43.3 inches (Shoulder to Bottom) Why Choose the Anzai 2-Layer Cotton Sack? Safe Fit: Narrower neckline prevents the sack from rising over the face. Premium Hardware: We use genuine YKK zippers for durability and safety. All-Natural: 100% cotton inside and out—no polyester, no toxins. Easy Care: Fully machine washable; the premium cotton becomes even softer with every wash.