ALPINESTARS GP Plus R v4 Rideknit® Leather Jacket - Black/Black - 56 3100324-1100-56GP Plus R v4 RIDEKNIT Leather Jacket is optimized for superior freedom of movement and rider comfort, and features extensive race derived features and materials including a dedicated Sport fit with pre curved arms for maximum riding performance, and race proven protection on shoulders and elbows Alpinestars composite stretch technology, A CS Plus, stretch panels on the torso for exceptional breathability, comfort, and freedom of movement, as well as