Fly swiftly in the light and flexible design of the GEL-Lyte33 2 ASICS.Built for the neutral to underprontor looking for a light, speedy ride that doesn't compromise cushioning.Features Includes:Breathable mesh upper.Lightweight synthetic overlays.F.A.S.T. Heel? - Lightweight heel design hugs the foot securely while minimizing structural weight.Plush tongue and collar.Breathable fabric lining for a great in-shoe feel.Molded foam insole supplies light underfoot cushioning.SpEVA® midsole material maximizes energy return while reducing midsole breakdown.Rearfoot Gel® cushioning system attenuates impacting shock and allows for a smooth transition to midstance.F.A.S.T. Drop - 6mm midsole differential promotes a mid-foot to forefoot strike.F.A.S.T. Sole - Minimal outsole material is strategically placed in only high-wear areas.Guidance Line® technology employs a vertical flex groove that decouples the tooling along the line of progression for maximum stride efficiency.