All about sponges :)

hi again guys i got another question
its about sponges this time?
ive been hearing a lot about porous sponge , big pores, small pores, hard , soft and etc
what is the importance and how does it affect the rubber's overall performance? for example: how does a porous sponge differ from the one with smaller pores or how does porous sponge play its part in the game etc...

anything under the sun, based on facts, opinion, or experience will be great

i am hungry for knowledge

thx for taking time to answer my questions