Size + Material: Size Single -90 x 190 x 18 cm(35.4 x 74.8 x 7.1 inch); Small Double -120 x 190 x 18 cm(47.3 x 74.8 x 7.1 inch); Double -135 x 190 x 18 cm(53.1 x 74.8 x 7.1 inch); King -150 x 200 x 18 cm(59.1 x 78.7 x 7.1 inch). Fit Single bed. Material -16 cm spring +1.5 cm sponge + 5 mm memory foam. This perfect mattress is suitable for children, adults and the elderly Spring + Memory Foam: The spring mattress has the advantages of good elasticity, better supportability, strong air permeability and durability. Foam mattress can close the curve of the body, while providing support, it is flexible and flexible, and can also buffer the movement of the body Safety + Breathable: 100% comfortable and 3D breathable fabric of natural ecological fiber, completely environmentally and friendly. Antibiosis, Anti-odor, Anti-allergy, Anti-mites. Expel the steamy sweat from the contact surface between you and mattress so to keep body comfortable and dry when sleeping. (Fire-Safety, standard UK fire-retardant treatment. Flammability certifications: BS 7177 ) Medium Hardness: Not too hard Not too soft-Just right. The stainless steel spring ensures that high quality mattress has good support, and the memory foam ensures that the high quality mattress has good softness Ergonomic Design: Excellent shock-absorption and High resilience with massage wave shape, promote the blood circulation in good condition, fully relax your muscles and release the body stress, keep your spine balanced and positive, help adjust and correct your sleeping posture to greatly improve your sleeping quality