Shell Jet Cap forest green Know The Various Types of Tennis Courts Rebound Ace India. Gramicci Shell Jet Cap forest green Detailed with signature Gramicci touches at the front and back, this olive green cap is cut from nylon in a cool five panel construction. Fitted with embroidered eyelets, its firmly rooted in the brands rock climbing roots and completed with an adjustable back tab. Sizing: Regular one size Materials: 100% Nylon 100% Nylon 5 Panels Embroidered Branding Adjustable Back Tab