Compact mattress, highly breathable, thin bonnell coil, single, regular length, 11cm thick Highly breathable thin bonnell coil Recommended for those who value cost-effectiveness and like the comfort of a futon So that it won't be too hot to sleep It is generally said that people sweat a cupful while sleeping. The breathable, quick-drying 3D mesh keeps you fresh at all times. The fabric also prevents dust from escaping. This firmness is also recommended for those who sleep on futons. Uses highly resilient bonnell coils. The wires form a flat surface that provides firm support for the body. In addition, the coils are all hollow, allowing hot air to escape and preventing stuffiness.