This item is new and unused. I am selling it because I don't need it. This box sheet-style mat cover is perfect for the separately sold "(High Density Elastic) 55 Self-Inflating Mat DUO," featuring contact-cooling fabric with a Q-max value of 0.4 or higher. It's easy to attach, just by covering the mat. Even in high temperatures and humidity, the cool "cooling" and dry "sweat-absorbing" fabric will make summer tent camping more comfortable. It's machine washable, so you can always keep it clean. Thank you for looking.