The d3o's back guard is made from an advanced patented polymer in which intelligent molecules bond in the event of an impact. Due to this, the protective insert for the back can be thinner and lighter, making the jacket more comfortable to put on and wear. However, the reduced volume of the protective insert for the back does not damage its protective properties.
Safety certificate: EN 1621-2: 2014, level 1
Warning about safe use:
If your motorcycle jacket is equipped with D3O protective inserts, do not twist it excessively, do not put heavy objects on top. At low temperatures, the material becomes stiffer and when trying to bend, unbend or otherwise deform with force, the protective inserts may crack. Read the instructions before use.