The Ultra Light Collection is the lightest and smallest packable SI Mat from Sea to Summit. The specially designed core reduces the weight by 20%, while maintaining cushioning and support in key areas of the body. The BodyZone die-cut foam construction optimizes warmth in important parts of the mat while minimizing weight in other areas. An anti-slip print on the surface and bottom keeps the sleeping bag and mat in place. The multifunctional, high-flow valve allows for easy inflation, one-way deflation, and fine-tuning for comfort.