The running sock that balances a feeling of protection and performance. Comfort that keeps you going. Technology Comfort that keeps going Remove reasons for turning back with the Mid Sock. It’s all about balance. Lightweight and breathable, yet snug with subtle support. Technical mesh to regulate temperature. All in a sock just high enough for a feeling of both protection and performance. So you’ll want to extend your run. Materials Technical mesh On Performance Socks combine a polyamide and elastane blend with technical mesh paneling. The mesh sections help keep foot temperature in perfect balance. Cooling when things heat up, warm enough that you won't get cold feet - whatever you're about to take on. Design Tell your feet it's go time Your running sock might not win you the race, but it could lose you one if it doesn't perform. That's why we set out to see how much performance we could put into a running sock. Turns out, a lot. Like the pattern at the arch which triggers sensory receptors to prime your feet for the run. Plus Swiss Engineering to then keep the sock firmly in place. For performance standards that don't slip. Sizing XS (US 5-6) S (US 7-8) M (US 8.5-9.5) L (US 10-11)