After finally figuring out what “sap” and “blackjack” mean — they’re used interchangeably to describe a police baton — this Sap Cap is a bit scary in its simplicity but might make for a good always-with-you self defense tool. That’s if you’re down with logo-less black hats and don’t mind shelling out $30 for something like this.

According to the product description:

This standard baseball cap can be used as a blackjack or sap. Just use the bill as the handle and the cap as an impact weapon. The secret of the Sap Cap is the pocket of a unique impact material that is 110% the density of lead and will not rust. Velcro adjustment.

Ah yes, the all-important velcro adjustment. You don’t want to rely on those plastic knob-hole snappy things when you’re wearing a weighted billy club on your head.

Sap Cap [BudK via Nerd Approved]