Icon D30 Back Protector Insert An advanced, patented polymer, CE-rated D3O impact protectors are the latest advancement in protective armor. D3O impact protectors utilize intelligent molecules that lock together on impact. Because of this, the impact protector can be made thinner and lighter, making a jacket more comfortable and easier to wear. However, this decreased size does not come at the expense of impact protection. Will fit any ICON Jacket that was originally equipped with ICON Dual Density Back Pad. The shape is slightly different, but the D3O Back Insert will fit into the Jacket's Back Pocket.