I own a pair of Ks1 vent 7/8 leggings and was happy with them, but because of how tight they are on my calves where the mesh seam is, I wanted a full length pair suitable for hiking in elevation. I bought the KX1s right before a hiking trip in the Arctic hoping they would help me love long hikes in elevation again. They exceeded my hopes and expectations. I felt bionic in these and have named them my “bionic pants.” I don’t know how they do it, but it has been years since I have been able to hike almost pain free, and with these , I feel only mild irritation in my bad knee. They keep my hip and knee tracking correctly and I’ve been able to embrace the trail again. I am thrilled to have found these. As an added bonus, the mosquitoes could not penetrate the neoprene! I do think they would be too hot in warmer climates, but in temperatures of 5-20 degrees C they were fine. The only negative thing I have to say is that the cost of returning these pants if they don’t work out for you is a deterrent to taking a risk (over $30 CAD in postage). It would be nice if Bracelayer could do as some other smaller Canadian companies are now doing and provide an optional return insurance. I was lucky that mine fit perfectly - but definitely do your size research first. Otherwise, all I can say is that these are a true game changer for me!