This self-inflating mat from Soomloom features a double valve. It measures approximately 185cm long x 55cm wide x 3cm thick, and packs down to approximately 30cm x ɸ15cm, making it suitable for backpacking and similar activities. It can be used in conjunction with EVA mats for added comfort. To store, open the air valve, fold the mat in half, and roll it up while pressing out the air. This will make it compact. The item is in excellent condition with little use. Thank you.