It is always great to catch blogger reviews of Sticky Heelz as they have independently tested the product. See the vlog below by Shout Magazine as they tested the products prior to Christmas:
https://www.youtube.com/watch?v=0ZOmC0-RxP4 (around 7:50)
Going travelling, well check out AsYouWish blog where it is recommended that Sticky Heelz is packed in your travel bag for when your feet start to hurt in your shoes.
http://www.asyouwishuk.com/home/whats-in-my-flight-bag