Sea To Summit Camp Plus SI Sleeping Mat Large OD GreenThe Camp Plus S. I. is designed to provide maximum comfort for people chasing a versatile all around sleeping mat. Combining robust and durable 75D fabrics with the unique Delta Coring technique allows the removal of over 40% of foam for a compact do it all mat. Built thicker than the original Camp Mat S. I. and using horizontal Delta Coring, the Camp Plus S. I. provides great value, durability and comfort. The 75D polyester makes for a tougher, more