Water proof Underpad , Mattress Protector Extra Large 180 x 145 cm / 70.8 x 57.1 in 

Description

It is 100% waterproof, yet breathable. It will provide excellent protection against fluids and urine.

180 x 145 cm / 70.8 x 57.1 in 
recommended for Semi Double, Double and Queen size futon mattresses

No elastic band attached

Top side : Polyester 100%
Bottom side : Laminated polyurethane
recommended for Semi Double and Double size futon mattresses

Made in Japan

Please machine wash gently.  Avoid using a dehydrator, heat dryers above 90 °C/190°F , and ironing.

size reference
this pad on the double size futon mattress