FoamRush 38 x 75 Twin Bed Foam Mattress RV High Density Firm Replacement USA

  
Uses : ideal for oval and round poker tables, furniture cushions, boat cushions, car cushions, foam mattresses and bedding support. Density : 1.8, 44lb compression. High density foam has a compression rate of 44 lbs. It features the perfect amount of cushioning and stiffness.

Its soft but still holds its firmness and support for an individual to sit on it without compressing the foam too much. Compression = firmness compression (not density) is what determines firmness.

If you don't want a cushion that's hard as a rock or a mattress that sinks when you sit on it, you have to check the compression or ILD number. Compression means the number of pounds necessary to compress a piece of foam 25% and still bounce back to the original thickness. For example, a 4 thick piece of foam that requires 33 lbs. To pack it down 1" and have it return to its full 4" thickness has a 33 lb. Do not open with a box cutter.

Use a ball point pen or a pencil. Start by making a little incision and break it from there - durability : will last 7 to 10 years. Your item must be unused and in the same condition that you received it in.