It's all worth it when you cross the finish line, but getting to that point is no easy feat. Darn Tough's BPM 1/4 Light Cushion Sock will see you through grueling training runs and painful intervals. Merino wool breathes well during high-output activities, and the light cushioning along the base of your foot will keep you comfortable—well, as comfortable as you can be when you max out your back squat.