The Flow models have no hard shell and are therefore lightweight, extremely comfortable, ultra-slim and compact. These elbow pads, developed with mountain bike legend Hans Rey, are extremely compact and slip easily into a backpack. The XmatterTM foam padding provides excellent shock absorption and optimum protection. With Flow Evo + models, features such as removable padding and new-generation AeroMeshTM fabric further enhance comfort and fit. All iXS protectors meet the requirements of European safety standards EN1621-1 and EN1621-2 - XmatterTM protective foam (removable) - AeroMeshTM lightweight, moisture-wicking, breathable, antibacterial, durable, comfortable. - LoopLockTM fasteners - Silicone straps