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4" All Cotton King Black Duct Futon Mattress - Overstock - 17742942
King Size 5″ Organic Cotton & Wool Futon Mattress – Right Futons & Waterbeds
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Organic Cotton Futon Mattress Made in USA Chemical-free – Rawganique
Amazon.com: Mattress Cotton Futon Mattress, Soy Protein Fiber Dormitory Mattress Soft Japanese Floor Sleeping Pad Foldable Tatami Floor Mat Home Sleeping Pad (Color : Yellow, Size : 120x200cm) : Home & Kitchen