Montbell offers the UL Comfort System Pads, Extensions and Pillows that uses a Quick Connect system that allows extension pads or pillows to be easily connected for the ultimate in versatility. Tube construction on the self inflating pads increases durability while reducing weight dramatically. Non-slip material is used for the surface of the pads to keep you from slipping as you sleep at night. Lightweight and thermally efficient foam is consistent throughout the pads for a warmer pad with no cold spots.