This Flyknit Trainer Chukka SFB released in March 2015 as part of the seasonal NikeLab ACG collection, designed for sport utility and weather protection. The rugged silhouette features a black Flyknit upper finished with Defender Repellent Systems for water-resistance. Integrated Flywire cables offer a locked-down fit, while the SFB outsole in contrasting white provides traction.