Natural blondes are the mostly likely candidates for fine hair. Blonde hair strands are more delicate than darker hair colors. Also, if you boost your natural tone by using bleaches and highlights, you can end up with broken and frizzy locks. Help keep things going smoothly with Fudge Unleaded Defrizz Blonde (average price $20). Serums are best for thin hair because they aren't very heavy and this one conditions while enhancing your color.