Men's Reebok Nano X4 White gum Worn ~5 times. Just prefer my other training shoes Men's Reebok® Nano X4 :: Innovation and high performance. Your updated Men's Reebok Nano X4 is the future of cross-training shoes! Its innovative FLEXWEAVE upper blends unparalleled hug and support with a premium aesthetic. Featuring an engineered midfoot ventilation panel for breathable bliss, this shoe excels when workouts heat up. The redesigned TPU heel clip offers more stable power from the heel than ever before to assist squats. And for the finishing touch, your Nano X4 has a new collared lining and antimicrobial sock liner in which you can revel.