Small Double Mattresses

What is the small double mattress size?

Size: 120 cm wide x 190 cm long

How good are the small double mattresses from Sleep Penguin?

Small double size (120 cm wide) or three-quarter mattresses are best for guest rooms or individual sleeper who prefers larger than a single bed. People who have smaller bedrooms may also choose to use a small double mattress instead of a full size double bed.