Tifosi Swank S marathonaccessory The SD100v4 has a traditional

The SD100v4 has a traditional construction and a synthetic and mesh upper for durability during various sprinting events

Full-length Air Zoom unit compared to forefoot and heel Air Zoom units in previous models

streamlined strap securely locks you in

MIZUNO ENERZY NXT: The next generation of MIZUNO ENERZY midsole material

5% spandex

Tifosi Swank S marathonaccessory The SD100v4 has a traditionalSwank S: Sunglasses for Small Faces Built to Move Most lifestyle frames are engineered for average face sizes, leaving extra small and small face consumers with frames that slip, gap, and never quite sit right. Swank S changes that with a reduced overall frame size and a 6 base curved design that wraps smaller faces the way a performance frame should. Finally, sunglasses for small faces that fit like they were made for you because they were. A Smarter