These patented, self-inflating sleeping pads come with a special "hexagon" surface that actually grips your sleeping bag, keeping you from slipping or sliding off the mat while sleeping. It utilizes a patented process called Surface Modification Technology to create these "hexagons" to provide extra comfort and nonslip performance. The HexaGrip Pads with Pillow feature a built-in pillow that inflates as you lay down. This added feature is attractive to people who are looking for an "adjustable" pillow to help smooth out hard or uneven surfaces. The outer fabric is laminated to a high quality open cell foam that has rapid inflation properties and will last for many years.