SKU: SS22848 Weighs: 470g R-Value: 2.9 Season Rating: 3 Season Mat Size: Regular Mat Type: Airbeds The Ultra 3R M mat is the lightest Full-sized Rectangular mat to benefit from having polyester insulation in Exped's refreshed range. The Mummy version is lighter but somepeople struggle to keep their legs on a mummy sha… Ultra 3R M Sleeping Mat