why is my skin white and thick and why is there a thick layer of fat underneath

Dear Student ,

Your question is somewhat abrupt and seems to be incomplete. But I am assuming that you have asked Why Penguins has White skin colour so based on my assumption here is your answer -
Penguin have black back with white bellies . This type of coloration is called Camouflage.

Also , they have fat layer of skin underneath which helps them in staying warm in cold climates.

It is requested to please ask a proper question so that we can assist you in best possible way.

Regards!