Giant Shadow ST Seat Bags feature water resistant ProTextura fabric construction with a water-resistant nylon zip. A simple anti-slip hook and loop Velcro strap fitting allows easy removal and fitting and the reflective strip offers improved low light visibility with a tail light hanger for adding your own light. Material: ProTextura Closure: Water-resistant nylon zip Fixing: Anti-slip hook-and-loop Velcro straps Features: Reflective strip, tail light hanger SizeVolumeDimensions Small0.6L 120mm x 70mm x 75mmMedium1.0L130mm x 95mm x 90mmLarge1.5L145mm x 100mm x 105mm