Womens Sof Sole Athletic + Arch Insole Lightfeet this spike is optimized for

this spike is optimized for events ranging from 800m to 5K

The Endorphin Speed 4 features a re-engineered winged nylon plate that provides just the right balance of flexibility and rigidity

MATERIAL: 34 % NYLON

ULTRA IMMUNE C provides direct and immediate support to the immune system to reduce the duration and severity of symptoms associated with the common cold

Womens Sof Sole Athletic + Arch Insole Lightfeet this spike is optimized forThe Sof Sole Athletic + Arch Insole is designed specifically for customers with high arches or anyone looking for enhanced arch cushioning. TECHNOLOGY This cushioned insole gives you an increased feeling of anatomical correctness and stability.