The R1 features a CPU outsole with an exceptional light weight of 8.5 oz (US M9), but may produce noticeable noise on rainy days or on wooden floors.
 
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