I recommend putting a skin on it. I skin all of my devices with the clear skins from bestskinsever. Now to preface this, I have years of experience doing so. It takes a significant amount of patience to apply the skin, as it is a wet install. Once its on though its transparent and gives the film an awesome grip. I put it on all of my computers too and have it on my 2017 MacBook Pro.
All three of the below phones have a skin on them, as I prefer carrying phones without a case. You cannot see the skin, but boy does it provide a lovely grip:
Incidentally, I have no affiliation with bestskinsever, I am just a huge fan of their product and have been for years.