Athletic Propulsion Labs: APL Ascend in Metallic Gold. - size 8 (also in ) Athletic Propulsion Labs: APL Ascend in Metallic Gold. - size 8 (also in ) Metallic textile upper with rubber sole. Lace-up front. AHPR-MZ51. 1 3 001 048. Athletic Propulsion Labs offers unique sportswear that fuses technology, performance and fashion, enabling athletes to maximize their potential in all aspects of their life. The revolutionary products symbolize the ultimate intersection of design and performance.