Even top athletes such as David Dellow and Ben Allen are swearing by these things, and for what it's worth, we think that they're pretty darn awesome too. Engineered in Switzerland, the On Cloudracer's mega-lightweight design is so tough that it will last 4-5 marathons and the mesh reduces moisture to ensure you remain blister-free. Trust us, invest in a pair of these and your feet - and knees - will thank you for it.