Responsive full-length cushioning sculpted to energize an icon. Responsive cushioning in the Pegasus 42 provides an energized ride for everyday road running. Experience unreal energy return with a curved, full-length Air Zoom unit and a ReactX foam midsole that’s lighter than the Peg 41. And, an improved waffle outsole with less rubber helps decrease weight without sacrificing trusted traction.Full-Length Air Zoom Unit — Nike sculpted our full-length Air Zoom unit to deliver a propulsive feel and Nike's highest energy return from heel to toe-off. ReactX Foam Midsole — ReactX foam is 13% more responsive than previous React technology. Breathable Upper — Lightweight mesh is softer and more breathable than earlier iterations, helping your feet stay comfortable. High-Abrasion Rubber Outsole — Lighter than previous models, an updated Waffle outsole delivers traction and flexibility with high-abrasion rubber and flex grooves. Wide Toe Box — They updated the fit to give you a little extra room at the toes and forefoot compared to the 41. What’s New? The full-length Air Zoom unit offers our optimal level of springiness underfoot. Waffle outsole has less rubber for a lighter design. Nike paired Nike ReactX foam (which they made lighter than the Pegasus 41) with the Air Zoom unit to give you a bouncy, springy sensation and an energized feel at toe-off. Signature waffle-inspired rubber outsole provides traction and flexibility. Nike reduced the amount of rubber as well, to reduce the weight of the overall shoe. Multi-zoned singled layer engineered mesh with haptic print and internal double layering helps you lock in. Plush collar, tongue and sockliner for a secure and comfortable fit.