Has anyone used these? http://www.skinvigor8.com.au/ They’re to prevent you from getting lines on your chest/between your brests when you sleep on your side.

I would like to try them but they seem very costly considering they last only 30 nights. Can anyone tell me if they are worth it?

Answer:
I love them! In fact I'm on my last one and need to order more. This is the only thing that works for me. If you treat them with care, they can last longer than 30 days. You can wash them gently in cool soapy water. Nothing else has ever worked for me!