Alpinestars GP Pro 1-Piece Leather Suit The Alpinestars' GP Pro one-piece leather suit reigns supreme on both road and track. Advanced protection features, perforated leather panel and strategically placed Aramidic stretch zones combine to offer the rider class-leading fit, comfort and performance. 1.3mm full grain leather. Perforated front leather panels. PU external sliders on the shoulders, elbows and knees. Aerodynamic, dual density back hump. U-Shape accordion stretch panels on the back. Accordion stretch panels on the elbows and knees. Aramidic stretch panels in the sleeves and crotch. Alpinestars patented calf expansion pockets improve range of fit. Removable mesh lining with stretch panel inserts work with outer stretch zones for a snug fit. Removable CE certified GP elbow and shoulder protectors. Removable CE certified GP-R knee and shin protectors. Chest pad compartments with PE protection padding (Alpinestars Bionic chest guards available as accessory upgrade). Bionic Back Race snap connection system. Replaceable GP knee sliders. YKK auto locking zippers.