Alpinestars SX Bionic Knee Protectors The 2012 Bionic SX Knee Protector is an advanced, streamlined guard that offers exceptional coverage to the knee, shin and lower thigh. The asymmetrical, anatomic design grants high levels of mobility while riding, while the use of lightweight, highly breathable construction materials ensure the knee guard remains comfortable, throughout a full day of riding. Features: • Super lightweight knee guard that provides exceptional impact protection. • Extensive protection zones fulfills CE standard EN 1621-1 (K+L Type B) • Constructed with highly breathable materials in an efficient ventilation configuration for superior airflow. • Complete TPU protector coverage over the knee, shin & lower thigh. • Inner medial knee cup features a sleek design for reduced material thickness between the knee and bike for greater control while riding. • Guard is backed with highly perforated, PU memory foam to keep you cool & comfortable • Slim, easy to adjust straps ensure a precise fit. • Sold as pair.