I purchased the wrong size and, although I opened it and washed it once, it's unused. Tate/Yoko Stretch N-Fit Sheet Semi-Double to Double (FT05 Cotton NV SD-D) Retail Price: ¥3,990 (tax included) A mattress cover made of stretch material for easy installation, suitable for semi-double size mattresses. ● Fits mattresses up to 38cm thick. Can be used for both futons and mattresses! ● Antibacterial and odor-resistant treatment ● Absorbent and quick-drying ● Elastic on the back ■ Compatible futon size: 120-140cm wide x 210cm long ■ Compatible mattress size: 120-140cm wide x 200cm long x up to 38cm depth ■ Composition: 95% polyester, 5% polyurethane ■ Machine washable (use a net) This is a sale of the fitted sheet only. - Color: Navy - Size: Semi-double - Features: Stretch material, easy to install - Compatible mattress: Futon and mattress compatible