Breathable, open weave cotton muslin wearable blanket replaces loose blankets for safer sleep. | Handy 2-way zipper for easy wearing and diaper changes. | TOG rating of 0.3, best for temperatures of 76-80 degrees F (the recommended sleep environment range). | Sizes: Small (0-6 Months, fits up to 28 inches), Medium (6-12 Months, fits up to 32 inches), Large (12-18 Months, fits up to 35 inches). | Coordinates with a variety of our quality baby essentials.