This mattress has a medium firmness. On a scale of 0-10, with 10 being the softest, this mattress would probably be a 6. The mattress's filling materials include springs, gel memory foam, and high-density foam, it does not contain any fiberglass material. We wrapped the edges of the mattress with fabric strips and each spring in the mattress is wrapped in a bag. This mattress provides great support and stability. The cover material of this mattress is skin-friendly. It is very breathable and soft, and sleeping on this mattress will not make people feel stuffy. The mattress foam is certified by CertiPUR-US and the cover is certified by OEKO-TEX. It uses friendly materials and can also improve sleep quality to a certain extent. Make people sleep more soundly. This mattress comes compressed and neatly packed in one box for easy transport. Open the box, unfold it, and enjoy a comfortable sleep. You’ll need to wait 48 to 72 hours for the mattress to fully expand. This hybrid mattress is ideal for most bed frames, including traditional platform beds, box spring beds, and bunk beds. When choosing a mattress, the first thing to consider is whether its dimensions will match your bed frame, at least 98% of the time. Both full-sized bed frames and mattresses will have different lengths and widths. The height of this mattress is 12 inches, there are 4 different sizes: The twin size mattress: 75 x 39 x 12 inches, 49.6 pounds The full size mattress: 75 x 54 x 12 inches, 66.8 pounds The queen size mattress: 80 x 60 x 12 inches, 75.8 pounds The king size mattress: 80 x 76 x 12 inches, 94.8 pounds