ThermaRest RidgeRest Classic Sleeping Pad - Regular Size The original returns, delivering our most basic level of backpacking comfort. Virtually indestructible, the RidgeRest® Classic mattress is a revival of the original. Using our most durable foam this mattress is sure to last many a year, delivering exceptional value to campers looking for basic comfort. Features: Light & Durable: Virtually indestructible and light enough to carry anywhere. Unique Design: Supportive peaks and heat-trapping valleys provide essential comfort. Watch this short video to find out more about the Therm-A-rest closed-Cell mattreses: Technical Features: Technology: Closed-cell mattress Colour: Charcoal R-Value: 2.0 Weight Regular Size: 14oz / 400g Large Size: 19oz / 540g Width: Regular Size: 20in / 51cm Large Size: 25in / 64cm Length: Regular Size: 72in / 183cm Large Size: 77in / 196cm Thickness: Regular Size: 0.625om / 1.5cm Large Size: 0.625om / 1.5cm Packed dimension:  Regular Size: 20 in x 8 in  /  51 cm x 20 cm Large Size: 25 in x 8.5 in  /  63 cm x 22 cm Material(s): Polyethylene Country of Origin: Made in Ireland Therm-A-rest closed-Cell mattreses: In 1986 Therm-a-Rest created the first modern closed-cell mattresses. In the years since, closed-cell mattresses have become a mainstay of climbers, backpackers and adventurers around the world. Since 2012, Therm-a-Rest has teamed up with other companies to create what would become known as the ASTM F3340-18 standard - This standard allows campers to look at two or more sleeping pads and directly compare the R-value of each. The construction for the pads has not changed, but the standard by which they are measured has.