The Pacific Outdoor Equipment InsulMat Hyper-Lite Womens Sleeping Pad combines the light weight and high thermal values of closed-cell foam with the comfort of open-cell, self-inflating mats. P.O.E placed the self-inflating insert at the hip and shoulder area for support where it really counts. Then they wrapped the insert in a highly insulative closed-cell foam body for warmth from head to toe. Specifically for women, this Hyper-Lite has extra supportive dot-cut foam in the hip area, so say goodbye to hard ground jabbing at your bones. While the valve placement might look strange, its actually the result of careful designing. At the top of the head, the valve stays out of the way when you roll over, and it also integrates more efficiently with the open-cell insert.