100% Merino Wool Lining / 100% Organic Cotton Outer Imported REDUCE OR ELIMINATE SLEEPLESS NIGHTS - When baby sleeps better, so do parents. Our sleep sack helps your baby stay warm and cozy, so they can have a long peaceful night. PREMIUM FABRICS for best comfort: Australian merino wool lining - 100% natural, luxuriously soft, and temperature regulating. GOTS certified organic cotton outer. Machine-washable. CAN BE USED IN ALL 4 SEASONS as optimal merino wool lining regulates body temperature unlike any other fiber, keeping baby warm when it’s cold, and cool when it’s warm. CLASSIC NO-SNAP DESIGN with a TWO-WAY ZIPPER that unzips from top and bottom for easy dressing and quick diaper changes. Opens flat. ZIPPER GUARDS to protect child’s skin. NURSERY THERMOMETER and dressing guide included. PREMIUM QUALITY - Buy with confidence from Woolino, a trusted US company, offering US customer service and industry leading warranty for your peace of mind. The industry leader in merino wool baby essentials since 2010.