Customized colors not available otherwise! Worn outside for less than 5k. Nike recommends sizing up half size, I wear a 10 normally and they fit but feel slightly narrow. From the website: Continue the next evolution of speed with a racing shoe made to you help chase new goals and records. It helps improve comfort and breathability with a redesigned upper. From a 10K to a marathon, this model, like the previous version, has the responsive cushioning and secure support to push you towards your personal best.