Altra Torin 9 - Womens Shoe size:6 (US) These track spikes are built

These track spikes are built to maximize propulsion and efficiency for middle to long-distance track races

a nitrogen-infused supercritical foam

The nitrogen-infused Mizuno Enerzy Nxt top midsole offers incredible energy return and plush cushioning

notably cardiovascular health and blood sugar support

Altra Torin 9 - Womens Shoe size:6 (US) These track spikes are builtTap into unique comfort with the Torin 9. Its responsive, soft, and performance focused, so you can be uniquely you on your next road run. With an all new durable Vibram XS DURA rubber outsole, its 8. 5% grippier than the Torin 8 and made for whatever the road throws your way. An all new P35X dual density foam is built to deliver an energetic, cushioned underfoot feel by combining a soft foam with a firmer one for a stable and comfortable ride. Altra