Bumper core

An elongated bumper core of a polyolefin-based resin-containing foam having a density of 0.045-0.2 g/cm 3 and showing a compressive load of F 20 at 20 % strain, a compressive load of F 40 at 40 % strain and a compressive load of F 60 at 60 % strain when compressed by a rigid pipe having an outer diameter of 70 mm at a compression speed of 500 mm/minute, wherein the ratio F 20 /F 40 is in the range of 0.6-1.3 and the ratio F 60 /F 40 is in the range of 0.75-1.3.