The Thermarest NeoAir Unberlite is the absolute lightest insulated air mattress keeping you pack featherweight on the trail. Thermarest's proprietary construction provides the critical warmth needed in the backcountry. Boasting 2.5 inches of the legendary NeoAir comfort, the minimal UberLite makes a big impact during nights in the backcountry. To endure the rigors of the backcountry, the unique fabrics and construction meet Thermarest's strict durability standards. NeoAir Uberlite L Sleeping Mat