I went for the thickest film to give the greatest protection for my motorhome headlights. They are big. 12x32 just about covered each one. I was worried that it would be difficult to get such thick stuff to go round the curves. I was wrong. It seems the thicker it is the easier it is. No flopping about or folding and wrinkling at all. No heating required. I was shocked an surprised in a good way. That doesn't happen often.