Comparing the resilience of High Density Polyethylene (HDPE) and Ultra High Molecular Weight Polyethylene (UHMW-PE) at -20 degrees Celsius.
The really interesting bit starts at ~ 40s, but in this case “really interesting” is a subjective term – this video is likely only to be of interest to those looking to make or purchase a toboggan.

Please note: while this video shows small bits of HDPE plastic snapping at cold temperatures while being flexed towards 180 degrees, in practice we have never had a well-maintained HDPE toboggan snap, even at temperatures as low as -40 degrees Celsius.