Shimano RX600 Gravel Shoes Lightweight, comfortable and stiff enough for efficient pedalling, the Shimano RX600 Gravel Shoes suit mixed terrain and off-road cycling. The carbon-reinforced nylon sole is paired with a synthetic leather upper that's micro-perforated and incorporates mesh inserts for additional breathability. A single BOA and Velcro toe strap on each shoe create a secure fit that allows for micro-adjustments. Durable TPU lugs enhance grip when clambering over tricky terrain or up steep climbs and reflective print on the heel aids visibility in low light.