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When your skin feels dry, you slather on moisturizer. Do the same for your hair. Look for treatments with protein, collagen, and amino acids, which "strengthen by forming a shield around your hair shaft," Wilson says. Also, after you rinse out your conditioner, apply a leave-in kind for an extra boost of hydration. If you'll be exercising outside, spray on a lightweight, dry oil mist and put your hair in a bun.