SKU: SS22860 Weighs: 568g R-Value: 4.8 Season Rating: Winter Mat Size: Long Wide Mat Type: Airbeds If you definitely need a full 4 season mat but you want one that's a bit longer and wider than the standard mat then at just 540grams this is a good lightweight option. Exped's Ultra 5R Sleeping Mats are intended for 4 s… Ultra 5R LW Mummy Sleeping Mat