Men's R1

R1. Record-breaking race-day shoe loved by ultrarunners. For: Road Running, Race Product Details Activity: Road Running Best for: Races of 100 km and above, multi-day races Pace: 6-13 min/mi (4-8 min/km) Upper: Double-layered Jacquard, 40% Recycled Polyester Stack Height: Heel 35 mm, Forefoot 27 mm Weight: 8.5 oz / 240 g (US 9) Heel-To-Toe Drop: 8 mm Key Features TUNEDFIT Dual Lacing System for separate lace adjustment Dual-zone ZeroSag midsole inserts with little degradation during long runs LightCELL midsole base featuring excellent lightness and bounce GOFLOW midsole geometry to guide your stride Double-layered jacquard upper with 40% recycled polyester Recognized with APMA Seal of Acceptance for promoting good foot health