Mountain King Trail Blaze are my choice of poles for alpine trail running and hiking, because they are ultralight, foldable and durable. I plan to use them in Trail Verbier St-Bernard 110 km. Sticks do help a lot when you have to go up and down mountains. You can conveniently attach them to your backpack (I've used Raidlight Olmo 5) if you don't want/need them at some point. Rules usually say that you have to carry them all the way to the finish, if you decide to start an ultra trail race with them.