UV protector for hair- anything?

[Hollysberries]

I pay a small fortune for half a head of lowlights, but once the sun's out they go lighter and lighter till they're blonde.

Is there a product (not a shampoo) which you can spray on daily if it's sunny? I don't always want to wear a hat. I wear a cap when I'm outside exercising.

https://www.ultrasun.co.uk/products/ultrasun-uv-face-scalp-mist

You could give this a go... maybe blocking the UV rays would help the colour.

Aveda do hair sunblock

I bought a Wella one from Amazon last summer, I will look if they still have it.

https://www.wella.com/professional/en-UK/hair-care/invigo-sun/sun-protection-spray

This one.

Thanks all.

I was having a good look online and so many seem to be about keeping hair moisturised after swimming etc rather than blocking UV.