If you have purchased a hard hat from 3M that claimed to protect you against an electrical shock, you may be due a free replacement hard hat, the US Consumer Product Safety Commission announced recently. The company has recalled a specific hard hat that was marketed as providing electrical shock protection, but they later found out that it does not.  About 7,500 units of the specific hard hat have been sold online between January 2008 and April 2016.  Thankfully, no injuries have been reported due to use of the hard hat.