Why don't gloves explain this idea for warming up your fingers quickly?

Question

Sometimes wearing gloves is not enough for keeping your fingers warm.So this winter I noticed that if I withdraw my fingers from the glove fingers and form a fist (with my fist still completely within the glove but with the glove fingers now empty), my fingers will warm up quickly.Why don't gloves come with instructions that describe this simple trick for warming up your fingers?

smt88 · Accepted Answer

Why doesn't soup come with instructions to blow across the top of it to cool it faster?

PopAlongKid · Answer

Because anyone who has ever worn a mitten has probably already figured it out.

hn8305823 · Answer

Everyone in cold climates learns this by the time they are 5 years old