The Titan Pro D3O® Elbow Guards provide you with the peace of mind D3O® armor provides. The flexible live hinge system and compression lining deliver more comfort, flexibility and movement, while the fully-vented elbow keeps air flowing while you ride. Live hinge system allows arm more flexibility. Fully-vented elbow with nested D3O® Armor dampening. Injection-molded bicep for comfort and safety. Compression-molded liner for superior comfort. Sold as a pair. D3O is a long-chain polymer with off-shoots. The intelligent molecules move freely among themselves and, in the case of a collision, they move past the off-shoots together and spread the force over a large area. The D3O protectors are very soft, flexible and thin. And, they adapt to fit the body.