The ultimate road-to-trail sandal, our Aventrail R2T is designed to run wild. Merging the airiness of a sandal with the propulsion of a trail runner, this lightweight running sandal liberates toes with a LITE-COMFA(R) midsole, secure strapping system, and gravel-grinding Spider RubberA(R) Endure outsole that&';s built to go from the front door to your local trail and back. Breathable neoprene mesh under straps for comfort and moisture management Patent-pending W Strapping System provides support, adjustability, and personalized fit Nylon return rings and strap tips for durability LITE-COMFA(R) midsole for responsive cushioning Spider RubberA(R) outsole with 3.5mm lugs for road to gravel capable traction Sustainability Initiative(s): 52% REPREVEA(R) recycled polyester straps, mesh upper made with 27% recycled nylon and 33% recycled polyester Best for:Trail Running Half pair weight for size M9: 8.11oz Drop: 8.5mm Stack: Heel 40.5mm / FF 32mm.