SKU: SS23618 Weighs: 403g R-Value: 2.9 Season Rating: 3 Season Mat Size: Short Mat Type: Airbeds Exped's Ultra 3R Sleeping Mats are intended for three season use and have an R-Value of 2.9, this is the most popular season rating for sleeping mats and so there are a wide range of sizes available, either Rectangular o… Ultra 3R S Sleeping Mat