F-fluorine-9

$36.00

Fun facts: The most reactive element on the periodic table—so aggressive it can burn through glass and react with water explosively. Quite difficult to store. Found in everything from rocket fuel to toothpaste (as fluoride).

Great for: Aerospace buffs, cavity fighters, and people named Frank, Fawn, and Fiona. A scientific F word.

Wear the flair of a Fluorine atomic element hat from Lidnium. Crafted from premium washed cotton with precise F symbol embroidery and an adjustable fit, this cap lets you stand out—whether you’re celebrating a milestone or powering through your day. Wearing a Lidnium cap adds a little juice to your day, and Fluorine takes it to the next level.