SKU: SS22864 Weighs: 650g R-Value: 7.1 Season Rating: Winter Mat Size: Regular 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 650grams this mat delivers excellent performance for its weight. Exped says: The … Ultra 7R MW Mummy Sleeping Mat