The Merino Kids organic cotton baby sleep sack features the same award-winning design as Merino Kids merino sleep sacks, with two layers of organic cotton pin-stripe interlock fabric, 100% natural and GOTS-certified organic, grown pesticide-free and manufactured without the use of harmful chemicals.Design Features:Patented safety belt aperture enables safe travel in stroller or car seat.Baby has freedom to move naturally and room to grow yet they can"t slip underneath, nor wriggle out and wake up cold.Contoured bodice stays clear of face.Full-length self-locking zipper down one side, away from face. Zipper sewn inside lining so won"t scratch.Opens up flat for easy dressing. Unzips bottom-up for quick diaper changes.Fits growing child safely and comfortably for up to two years. Quality workmanship ensures years of wear. Excellent value compared to other sleep sacks that last only a few months.Two sizes, 0-2 years and 2-4 years.