Shimano Jo2A IceTech Finned pads have more engineering packed into them than many companies' entire calipers. It starts with the fins. By bringing the pad back plate out of the caliper body and adding air grabbing fins to it, Shimano increases the cooling capacity of the backplates. It doesn't stop there however, the finned portion of the backplate is made from aluminum which transfers heat more effectively than steel, once again for faster cooling.
Resin pads are softer and tend to be quieter. They offer more initial bite, but fade faster than metallic pads on longer descents. Do not use organic/semi-metallic/resin pads in wet conditions.
Shimano XTR-XT-SLX-Alfine J-Type Disc Brake Pads
Shimano's J-Type Disc Brake Pads ensure top braking performance and maintain the safety of your Shimano brake system. Having created Ice Technology into their disc brake pads to provide a cooling effect, which delivers a consistent and stable braking performance.
Resin Pad Features:
Resin pads make less noise than metal pads and offer better modulation.
Radiator Fin - provides long pad life and less fade by cooling technology