FoamRush premium, high-quality polyurethane non-fire retardant, foam blocks and cubes offer a variety of applications and uses, including: skateboard parks, gymnastics companies, trampoline arenas gymnastics facilities motorcycle, BMX, FMX,acrobats, ninja obstacle course. High density foam has a compression rate of 44lbs. Our foam cubes provide the utmost protection for your athletes and extreme thrill seekers safety by giving the athletes the confidence to train harder and reach their full potential while protecting them from injury with our foam pit cubes. 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 is firmness compression (not density) is what determines firmness. Foam packages need to be opened immediately in order to prevent damage. Do not open with a box cutter. Must take the vacuum packed foam pit cubes out of the boxes. Separate each foam pit cube for the vacuum packed foam cells to breathe in the air. You should see foam cubes starting to expand in 4 to 7 hours to its size and firmness. Allow 2 to 4 days for the foam pit cubes to recover its full original size and firmness from being vacuum pack. We compress everything down to the most economical size. Upholstery Foam Return Policy: We do not return fees. Your item must be unused and in the same condition that you received it in. Once your item has been returned to our returns department, there is a 50% restocking fee.