Add to the review the following: I just completed 225 miles and over 35,000 in total elevation gain doing the Coast to Coast in England. The poles were perfect. A fixed size is all you need. I never see anyonae adjust poles depending on terrain, you just move your hands on the grip. PLus the Z feature means they stow easily on the pole holders of my Osprey Manta 36. Everyone else struggles with where to stow their long adjustables, while I just folded mine them and stowed them on the pack. GREAT feature!! (Prior review follows) I've used these now on several hikes, from Montana winding up and down trails, to wet Brothers Wilderness trails, from ridiculously steep goat paths to rough traverses. Up and down the trail they are great support and assistance. Their lightness means you hardly feel like you are carrying anything, but there is no question they provide great support. My only issues are that the wrist straps seem to be wearing out pretty quickly and they rattle a bit with each pole plant. But I can live with both, because their ultra-light nature puts them way ahead of anything else I've used on the trail, from REI brand to others.