The Japanese futon mattress features a soft 105GSM microfiber surface and supportive sponge filling, offering excellent comfort with added fluffiness. At 3 inches thick, it's safe for floor use and can alleviate back discomfort on hard mattresses. Versatile for RVs, guest rooms, or dorms, it expands fully in 2-3 days after unboxing, and sun-drying enhances its fluffiness.