Onitsuka Tiger Ultimate 81 EX/ BIRCH/KALE/ 1183B510-203 Authentication Delivery and Returns. This model is a revival of the Ultimate 81, first released in 1981. The "EX" signifies an "Extended" version, featuring enhanced cushioning and a redesigned sole for superior comfort and performance. The upper is constructed with a combination of synthetic leather and mesh for breathability and durability. Available in a neutral beige colorway with kale accents, it offers a versatile and stylish option for everyday wear.