The Polar Bear white fur helps them bland in the snow so that they can be hard to see. There layers of fat under their fur helps them stay warm in the inside.They are excellent swimmers even if the water can be really freezing it is not a problem for Polar Bears and they dont just got physical adaptation they also got other adaptation like behavioral adaptation whitch is the way how the hunt they learn when to go when to not how to do stuff that takes time to have because it is a adaptation.