Can you put full size mattress on futon frame? - Quora
The Absolute Best Bed: A Japanese Futon | Wirecutter
YOSHOOT Futon Mattress, Padded Japanese Floor Mattress Quilted Bed Mattress Topper, Extra Thick Folding Sleeping Pad Breathable Floor Lounger Guest Bed for Camping Couch (Gray, Single) : Amazon.co.uk: Home & Kitchen
Can you put full size mattress on futon frame? - Quora
Your Mattress Could Be Harmful by Acting as a Radiation Antenna