World"s best and #1 top-selling merino sleep sack in the USA and worldwide. Others can"t beat Merino Kids" patented iF award-winning design, premium fabric and superior workmanship. * For parents who want the very best. Crafted by master tailors from luxuriously soft Superfine Merino wool. 100% natural, itch-free and allergy-safe. Organic cotton outer layer for extra durability. * Textile scientists recommend the Merino Kids sleep sack. Baby doesn"t wake up cold or overheat. Naturally absorbs and releases moisture to create the perfect safe micro-climate in any season for rooms 64°F to 80°F. * First sleep sack in the world to achieve the stringent UK BSI standard for baby sleep sack safety, and the only merino sleep sack certified to this safety standard. Baby has freedom to move yet can"t slip underneath or wriggle out. * Fits babies 0-2 years safely and comfortably. Innovative safety belt aperture makes it easy to transfer sleeping baby between car seat, stroller and nursery to maintain sleep routine.