Sidi Dust Gravel Shoes - Mens White/Black 41.5Sidi Dust Gravel Shoes Mens White Black 41. 5. Designed for the most technical gravel. The Sidi technology used for mountain biking is applied to the gravel discipline with its most technical aspects in a high performance rigid shoe with a closure designed for elevated levels. Techpro construction with integrated impact protectors on toes Sidi heel counter Dials system with Dyneema cable MTB SR17 sole with engineered durability and traction providing