Naturehike Air Mat R-value 5.8 Mummy type, S size The inflatable bag is from the old model. Used once for a tent stay. Selling because I'm replacing it. This air mat has a high R-value of 5.8, allowing comfortable use even in environments of -20°C or lower. - Brand: Naturehike - Model Name: Air Mat - Size: 58cm x 168cm - R-value: 5.8 Total weight: 510g - Operating temperature range: -20°C or lower - Features: Excellent heat retention, compact storage Thank you for viewing.