Celebrity inspiration Reese Witherspoon. Want this look but have thin fine hair that could never pull off a bob? Adding a minimal amount of hair extensions between the ears and below the occipital can add a bit of volume and length. Hair Extensions don't always have to be used for those that want longer hair. They are great for adding to a cut and style that would other wise fail without density. I myself love this look and if I was to cut into a bob, would have to add extensions to create a stronger line around the perimeter. Otherwise my hair is too thin.