Exped Camp & Hike Flexmat Sleeping Pad Lichen LW 7640277840768. FlexMat is a rapidly deployable lightweight and durable closed-cell foam mat truly an essential piece of outdoor gear. It can be used as a minimalist mat for 3-seasons or in tandem with an air mat adding ground-side durability and insulation. Because R-values are additive FlexMats R-value of 1.5 can be added to any mat which will boost warmth noticeably. The folding form is quick to open and has ample flex when the mat is packed back up to ensure a tidy load when attached to a backpack bike or kayak.