cross linked foam particles resist permanent compression

Speed you need for the trails.
Full speed ahead. The Endorphin Rift packs a punch thanks to high-mileage PWRRUN PB cushioning and SPEEDROLL technology. Fast, light, and as spontaneous as could be, this decorated speed shoe can tackle whatever terrain you throw at it. The thrill begins the minute you lace up. Go ahead, bomb that hill and take charge of your next trail.

Features:

• SPEEDROLL Technology propels you forward for effortless daily runs.
• PWRRUN PB cushioning gives you a lightweight feel with max energy return.
• With a PWRTRAC outsole for grip and aggressive lugs for traction, you have the confidence you need to head off the road.
• Weight: 8oz (226g)
• Offset: 6mm (29mm / 23mm)
• Lug Height: 4mm

Shock - absorbing heel