Used in races ranging from 800m to 3000m for approximately 8 months. These spikes are lightweight, have good responsiveness, and are very comfortable to wear. I was able to achieve my personal best while wearing them, so I really liked them! I'm selling them because I've outgrown them. I hope someone else can use them. - Brand: adidas - Model Name: ADIZERO AVANTI - Color: Fluorescent Yellow - Material: Synthetic Fiber Size: 24.5 Thank you for looking.