This plastic floor mat should have been shipped flat in a cardboard box the same size and shape as the mat. What they did was to roll up the plastic mat and ship it in a oversized cardboard box that allowed the mat to move and bend at the corners. I tried putting the mat under a carpet for a few days to try and flatten it out, with some degree of success. It's still a bit wavy and two corners are still bent. Would not order from them again!!