Y3 Qisan Cozy Trainers in Black. Y3 and Yohji Yamamoto are back this time with the Qisan Cosy silhouette. This slip-on trainer has a neoprene upper with rubber and leather detailing provides a snug, comfy fit. The midsole has lightstrike technology foam providing an extremely lightweight and springy cushion which is designed by Adidas to provide extra responsiveness and is featured on their basketball range of footwear. The rubber outsole finishes off the look of this unique trainer.