This is a three-season closed-cell mattress that folds up like an accordion for storage. The Z Lite Sol has an aluminum coating on the top surface. Compared to models without the aluminum coating, the insulation is improved by 20%. (Z Lite does not have an aluminum coating) The folding design allows for quick setup and storage, so you can easily use it without stress, even for short breaks. Specifications: Size: 51 x 183 cm Storage Size: 51 x 13 x 14 cm Total Weight: 410g Country of Origin: KOREA Thickness: 2.0 cm R-value: 2 *Please refrain from price negotiations. We will not respond to price reduction comments and will delete them. Thank you for your understanding. This item has been stored at home. It is a new, unused item. It has been opened for photography. The item will be wrapped in bubble wrap for shipping. Please note that it will not be packaged in a cardboard box. Please refrain from purchasing if you are sensitive to minor imperfections or if you are looking for a perfect item.