[...] after year and half of use its completely cracked with holes in it. i called about the lifefime warranty and was told that i if my office chair has carpet castor wheels then there is no warranty. There was not literature with my mat when i recieved it so how would i know this? there is no literature on staples website about this either so again there is no way i would know this. But the castor wheel issue aside my mat was still cracked from the get go and just got worse over time - regardless of the type of wheels being used. any way i do not recommend this product i might check out a different brand for my replacement.