Single size This item has been washed once, so please understand this before purchasing. Integrated sheet, mattress pad, and mattress protector Fits any bedding without wrinkles Stretchy gusset for improved fit Accommodates mattresses up to 38cm thick. Can be used on futons and mattresses Machine washable [Nitori's Moisture-Absorbing Heat-Generating (N Warm Double Super)] Surface fabric/Filling: Upper layer ● Moisture-absorbing heat generation (surface fabric/filling (upper layer)) ● Quick warming (surface fabric) ● Heat retention ● Far-infrared ray effect (surface fabric) ● Reduces cold feeling (surface fabric) ● Insulation (surface fabric) ● Moisturizing (surface fabric) ● Moisture-absorbing and releasing cotton used (surface fabric/filling (upper layer)) ● Anti-static (surface fabric) ● Antibacterial and odor-resistant (surface fabric) ● Deodorizing (filling (upper layer)) ■ Compatible futon size: Width 100 x Length 210cm ■ Compatible mattress size: Width 100 x Length 200 x Thickness up to 38cm