- Brand new in original box - Size 11.5 - 100% authentic, eBay will very authenticity The Nike ACG Mountain Fly Gore-Tex Sneaker Boot in Khaki is a rare find for sneaker enthusiasts. This brand new pair in size 11.5 features a stylish design with a combination of khaki and metallic silver accents. The athletic type sneaker is part of the Nike ACG product line, known for its durable construction and advanced technology. With a release date of November 2020, this sleek sneaker offers both style and functionality for the modern outdoor fashion-forward individual.