Because it just looks so damn good.
don't forgit aerodynamics too ;-)
Right! Reduces wind resistance.
Because spandex was popular in 60's and 70's when most of the superheroes comic books were written.
I THINK IT HAS TO DO WITH ALL THE LEAPS AND BOUNDS SCALING BUILDINGS
JUMPING FLYING BENDING SQUATTING ETC . OH YA AND FIGHTING THE BAD GUYS
U NEED FLEXIBILITY STRETCHABILITY BREATHABILITY MOBILITY ETC I THINK U GET
MY DRIFT LOL !
so that they can move comfortably ;-)
It fits under their clothes, optimizes speed and agility, and dries quick... doesn't it?
Cause they have super junk
not all of them but damn near all
It's all we can afford :)
It shows off their big *** muscles better.
*Actually, they wear spandex so the actors who play the superheroes can "look" like they have big muscles.
because they can
so spidey mans white sticky stuff dont stick!
Not alot of people know this but spandex is actually bullet proof ...................