To protect your hair from UV damage, especially after blonde highlights, you can take the following measures:

1. Wear a Hat or Use an Umbrella: This is the simplest form of physical protection. Opt for a wide-brimmed hat to better protect your scalp and hair.

2. Use Hair-Specific Sunscreen Products: There are products on the market specifically designed to protect hair and scalp from the sun. These can come in the form of sprays, lotions, or even post-shower treatments that offer UV protection.

3. Change Your Part Regularly: Avoid always parting your hair in the same place to prevent specific areas of your scalp from being exposed to the sun for extended periods.

4. Use Shampoos and Conditioners with Sunscreen: These products can provide extra protection for your hair during your regular wash routine.

5. Deep Conditioning and Repair: If your hair has already been damaged by the sun, use deep conditioning treatments or hair oils to help repair the damage.

6. Avoid Excessive Use of Heat Tools: High temperatures can further damage already fragile hair; let your hair air dry whenever possible.

7. Maintain a Healthy Lifestyle: A balanced diet, adequate sleep, and stress reduction all contribute to a healthy scalp environment, which in turn helps protect your hair.

8. Apply Hair Serums or Oils: Coating your hair with a serum or oil can create a protective layer on the hair shaft, reducing direct UV damage.

By following these methods, you can effectively protect your blonde highlights hair, reduce damage from UV rays, and maintain the health and luster of your blonde highlights hair.