The mat is equipped with a reflective ALU (aluminum) foil that reflects back the emitted heat (place the foil on top). They are compact and very light. Ideal for summer hiking and cycling. Protects against cold, moisture and dirt. The mat has sewn-in straps, so it can be packed into a small package and carried like a bag. The straps are not suitable for hanging the mat on a backpack, they can tear off.