Previously Used. Project Rock 4 training shoes engineered for intense workouts, featuring a highly breathable engineered mesh upper and a supportive knit collar for a secure, sock-like fit. These high-performance sneakers utilize UA TriBase technology to maximize ground contact and promote natural motion, while the external heel clip provides superior stability during heavy lifts. The vibrant neon colorway is accented with signature Brahma Bull branding and 'Blood. Sweat. Respect.' detailing on the heel, making them as stylish as they are functional for the gym or cross-training.