🔥 RARE / DEADSTOCK 🔥 Brand new with tags, never worn 2025 Brooks PR Challenge Crew Socks! Made in partnership with Custom Sock Lab. These are limited-edition, event-exclusive promo socks that you can't buy in stores. Perfect for race day, heavy training sessions, or adding some loud style to your daily miles. #Brooks #BrooksRunning #RunningSocks #ultrarunning #running