Why and what is an armpit tool? And why didn't we learn about this in school? Isn't talking about armpits like, really cool? Soap is really nice for surface bacteria, but that soap alone doesn't always cut it for armpits. Bacteria and product buildup can concentrate on your little pits, so sometimes they need a bit of extra care and attention. Routine's Dirty Hipster Armpit Tool, made of Cooper, helps to remove that buildup and odour causing bacteria, whilst providing an excellent lymphatic drainage.