I'm particular about running shoes and don't switch very often because of knee issues. I usually run with knee braces but first time I ran in them I forgot my braces and ran without them. These shoes are protective of knees because of the cushion and spring. Love the way they are built. When I put them on they immediately felt so comfortable with the cushioning. My knees still don't bother me when I run! A great shoe! I bought them to try because of the reviews posted. They truly are a wonderful running shoe! You won't be disappointed. As a note I always buy my running shoes 1/2 size larger as I did in this case. Very comfortable fit!!