Hi can you please explain what the difference is between the bumper and the wrap? I thought they were both for protecting your phone from scratches but not drops. If you have a slick wrap why is a bumper necessary? I just order a slick wrap myself for my first iphone so I dont know much about the dos/donts regarding it. I would like to know what bumper (if it is recommended to have a wrap and bumper) is the best as well. Thank you.