Supertech Jersey. Supertech is Alpinestars innovative Pro Level Motocross apparel line, designed for superior dirt riding performance. Supertech gear offers a full Factory Rider design, featuring a variety of SX and MXGP race-proven technologies that deliver premium levels of flexibility, freedom of movement, ventilation, durability, and rider comfort. Key Features: Pro Level Jersey Design: Featuring an extremely lightweight, premium athletic cut and fit, the Supertech Jersey with its engineered ergonomic cuts provides enhanced body movement on the track. Athletic Pro Level Racing Fit: Premium athletic performance race fit designed for aggressive riding and professional levels of movement, flexibility, and comfort.