Y3 Boxing Trainers in Navy / White. The Y3 Boxing is one of the most popular styles from the fusion between Japanese designer Yohji Yamamoto and adidas. This model features a breathable mesh upper with suede overlay panels and leather heel cage. Branding can be found to the heel and tongue and contrasting three-stripe branding borrowed from adidas sits on the side panel. Leather lining internally and a flat sole with geometric pattern.