Jitsie Knee Guards Dynamik Long (RHEON)New RHEON Knee Protection (the smooth side of the Rheon material goes towards the skin and honeycomb is facing outward) Innovation in trials is what the Jitsie brand is all about. Combining our extensive experience in trials apparel design with the new era of energy absorbing performance from RHEON has enabled us to create the most protective, most comfortable and most lightweight range of trials protectors. Developed to move with you on the bike.