The NikeLab Lupinek Flyknit ACG is a weatherized version of the Nike Flyknit Trainer Chukka that has been engineered for the winter months. This model comes with an extended padded collar, a black Flyknit upper and white Vac-Tech leather on the mudguard, collar and tongue. Underfoot, the shoe features a rugged, flexible Free-inspired sole unit with Phylon cushioning.