Reebok 3K KFS Junior Shoulder Pads. Shoulder pads feature KFS – Kynetic Fit system. Multi-layered protection with PE inserts to provide high levels of of protection and comfort as well. LOW profile JDP (Joint dispersion protection) caps disperse the energy of an impact away from a fragile shoulder joints. Molded bicep caps provide a solid protection from slashes and checks on the bicep.