They are extremely lightweight and comfortable. I ordered one size up, 45, as I have wide feet, but I could have done better with a size smaller, 44. After walking around 7 km, I felt the whole leg and feet were okay. Each had a good night's sleep, and the next day I hiked another 9 km. At the end, I was feeling okay, not better or worse than when I use my Asics. I clearly noticed the light weight.