A retrofitting bumper that is intended to be used in motorsports and in the vehicular industry consists of a main structural bar, a first pair of support bars, and a second pair of support bars. Preferably, the main structural bar is manufactured from ultra-high-molecular-weight polyethylene (UHMWPE) so that the memory shape behavior allows the main structural bar to retain the original shape even after impact. The first pair of support bars and the second pair of support bars are terminally and angularly mounted along a structural body of the main structural bar. A fastening mechanism, a first pair of attachment brackets, and a second pair of attachment brackets are used to mount the main structural bar, the first pair of support bars, and the second pair of support bars onto the frame of the ATV.