Mizuno Warmalite Hybrid FZ altra The OS1st® CS6® Performance Calf

The OS1st® CS6® Performance Calf Sleeves provide medical grade orthopedic support

710 ml / 24 oz capacity

Track Run mode for accurate track-specific distances

GO2™ breathable fabric keeps you warm and at the same time continues to dissipate excess heat

Mizuno Warmalite Hybrid FZ altra The OS1st® CS6® Performance CalfThe Mizuno Warmalite Hybrid FZ is a lightweight hybrid layer designed to keep you warm without overheating on colder runs. The Warmalite fabric delivers soft, brushed comfort with effective thermoregulation, while woven panels add wind protection where you need it most. Features Warmalite brushed fabric for warmth and temperature regulation Lightweight woven panels for added wind protection Hooded design for protection from the elements Thumb hole