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. 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.