Originally Posted by bwana
it didnt crack-just dented. the styrofoam inside is intact as well
Only the side you can see.
For the side you can see (the inside): If you were to use the proper measuring tool, I guaranty you that your skull compressed the foam. you can't see it cause it is displaced over a large surface with your head.
Compromised the integrity.
Helmets are designed to absorb impact and displace energy, once the foam is compressed, the surrounding area of impact (molecules inside foam) are also compacted. The entire area around the impact zone is also compromised (reaction), along with the general structural stability and construction.
In other words; the SHOCK from impact that caused a dent, also caused vibration throughout the construction. Might look and feel normal, but next impact, helmet could explode. The impact foam will not properly absorb skull impact against object after any type of compression.
Don't sell it.