The Camp Plus S.I. is designed to provide maximum comfort to those who are looking for a versatile all-round sleeping mat. The combination of robust and durable 75D fabric with the unique Delta Cores technology allows Sea to Summit to remove over 40% of foam and create a compact sleeping mat. The Camp Plus S.I. is thicker than the original Camp Mat S.I. and features horizontal Delta Cores. It offers high quality, durability and comfort. The use of 75D polyester provides a harder, more abrasion resistant base, while the Camp Plus S.I., with a thickness of 7.5 cm, provides sufficient cushioning even for lanky hips. The high R-value of 4.3 also means you can use it all year round. All Sea to Summit's self-inflating mats feature the unique, multifunctional single valve that was developed specifically for self-inflating mats. No more fighting against re-inflation when rolling up the mat! Available in two narrow bottom sizes and two wider rectangular sizes.