- Made of 95% organic cotton, 5% elastane jersey knit and the mesh is made of 100% polyester. Organic cotton is grown without the use of toxic and persistent pesticides and synthetic fertilizers. Machine washable. - Special swaddle wings keep your baby safely on their back all night long and is hip safe so it lets you see that the hips are always in the right position. - Open mesh helps prevent overheating. - Buttons that allow for the arms to be out of the swaddle. - This product is only intended for use with the SNOO Smart Sleeper Bassinet.