Thermarest ProLite Apex, a WingLock valve model, regular size (51 x 183 x 5 cm). This is an inflatable mat with an R-value of 3.8. It's the lightest and most compact model among self-inflating mattresses. I bought it for winter camping, but it turned out that a closed-cell mat was sufficient for the campsites I go to, so I no longer need it. I've used it about 5 times, and I inflated it with an electric air pump. There are no noticeable scratches or stains, and in my opinion, it's in good condition. * Color: Poppy * Size: 51 x 183 cm * Weight: 620g * Material: 50D Mini Hex Polyester * Thickness: 5 cm * Packed size: 33 x 18 cm * Made in USA