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The bears without the thicker skin died off over time since they didn't have the essential trait to make the land habitable.
Some bears had thicker fur while other bears didn't have thicker fur.
However the bears with the favorable trait ( thicker skin) reproduced and carried there traits on to there offspring which made polar bears have a larger population.
The bears with thicker skin is the more favorable trait because it helped the bears survive in the cold weather and not let them freeze to death.
The bears without the thicker skin had the unfavorable trait because they couldn't survive the weather and weren't suited for the environment.
Now in present day, all of the polar bears now have the favorable trait of thicker skin to help them be survive and adapt to their new icy land.