Strong, complex bonds reinforce structures and fabrics, improving a garment’s mechanical performance. PRO1 are breathable summer shorts. PRO1 are the must-have Rosti item. Ergonomic design shorts in Thunderbike fabric, 80% Polyammide and 20% Elastane. Thunderbike is a rubber polymer; more precisely, a fabric with high density bonds that reinforce its structure.Clean cut with internal silicone gripper around the thigh. Duotone mesh braces. For PRO1 the Rosti racing department has once again chosen the Bormio® pad with recycled yarns, suitable for long distances and with a quick-drying 3D structure.