The Pas Normal Studios x Salomon DRX DEFY GRVL is a lightweight guided trainer that empowers you to keep going, even off the pavement. Designed to comfortably bridge the gap between asphalt and gravel, the DRX DEFY GRVL wraps your foot to hold in place and deliver just the right amount of support. The trainer is built on the extremely responsive energyFOAM for premium cushioning and rebound.