If you are outdoors in a cold polar region during the day what will keep you warmer?

Details: The color is on the outside, the inside you can assume is a neutral gray for simplicity.

@freemo I want to say black because it absorbs light but polar bears are white and they seem like they know what they're doing.

@valleyforge Polar bears are actually way more complex than it appears. Their skin is black and their fur is white. Their fur acts like little fiber optic cables that channel light from the outside down to their skin where they warm up. It is actually quite brilliant design on the part of god/evolution/zeus.

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