adidas Predator Mania FG Japan Blue. The limited-edition Predator Mania FG ‘Active Blue’ draws inspiration from the legendary ‘Japan Blue’ Predator boot from 2002. The upper is virtually identical to the original, featuring premium K-leather construction in a blue, red and white color scheme. Details include curved forefoot pads and a long fold-over tongue that’s secured with an elastic strap. An updated split outsole is borrowed from the Predator Mutator 20+.