I use an Airex mat at home that is 1.5cm thick to protect my knees. But it's too heavy and big when rolled up, to travel with. I bought this Strongtek mat hoping for the best of both worlds, thickness/comfort and portability. It is made with a dense foam at 8mm thick, so it gives good protection for my knees and elbows. The top surface is grippy but not sticky. It has a nice soft feel to it. The bottom has more grip and works well on bare floors. For it's density, it is lightweight and a good width so it fits easily into my check-in bag. The strap is just a bit of webbing with elastic. It was taped to the outside of the package almost like an after thought (some reviewers said they never received one). I'll probably make my own out of something a bit more substantial. Very happy with the quality and the price, and would recommend.