The cosatto coolio 140 cot bed sprung mattress has a polypropylene liner with a super soft layer of luxury foam to securely sandwich the pocket sprung layer features an easy to remove du pont coolmax 3 layer system cover washable at 60 degrees individual pocket sprung interior designed to provide better support for little babies an adjustable waterproof liner just in case that can moved with the nappy area as baby grows a polypropylene liner ensuring the pocket sprung unit is securely enc