SKU: SS23621 Weighs: 689g R-Value: 7.1 Season Rating: Winter Mat Size: Long Wide Mat Type: Airbeds If you are looking for an 'extreme cold' mat and want a bit extra width so you don't find yourself on a stone cold tent floor then at just 689 grams this mat delivers excellent performance for its weight. Exped says:&nbs… Ultra 7R LW Mummy Sleeping Mat