Castelli Mens MTN-Qhubeka Volo Cycling Short - V4002003 Affinity Lycra fabric on inside of leg for outstanding stretch and rebound Affinity BLC textured fabric on legs for better aerodynamics Giro Air engineered mesh gripper Flat-lock stitching. Mesh straps for comfort and breathability Improved form-fit cut for cycling position Reflective detailing on back