ProLite series mattresses are born to be test winners and people's favorites. This new model is suitable for three season use but still compact enough to carry around with ease. Its surface fabrics are durable ProLite quality: not hysterically thin, but still light enough for demanding users. The Apex is thicker than other Prolite pads thanks to its StrataCore structure: a regular foam plate is equipped with ridges, helping trap more air in. - Regular model: 183 x 51 x 5 cm - Self-inflating StrataCore structure: the pad draws most air in by itself, after which you can adjust the hardness by blowing more air in or letting some out - R value 3.8, suitable for three season use - Surface fabrics: 50 denier polyester - Urethane foam filled - WingLock valve for three times the airflow of the old one - Included: stuff sack and patch kit - Made in Ireland Follow instructions on how to use the mattress: it may require inflation by blowing when taken out of its factory package. It is wise to