Pureology is a company known for excellent but high priced products. If you'd like a product that will straighten your hair and add protection from the summer sun you might consider this one. I haven't heard any personal reviews of it so hopefully someone can comment on it. Here's what it does:

Straighten your frizzy or curly hair with this humidity-resistant
Protects against UVA/UVB and thermal damage
Penetrates the hair shaft to smooth from within
Color protecting styler
Delivers natural conditioning

I'll see if I can dig up a photo of the product.
Regards,
John