Silicone,Mesh Imported Silicone,Mesh A low profile, slip-on knee pad for mountain biking that provides crash protection when you need it but doesn't get in the way when you don't Double layer, impact reactive foam offers crash protection in a minimalist package without bulk and unnecessary weight Internal silicone strips combined with a compression fit mean the pads form closely around the upper thigh and upper calf giving a consistent non-slip fit The breathable 4-way stretch mesh that runs the full length on the inside for airflow. Roll-able and stow-able size for convenience. Designed beyond CE EN 1621/1 2012 Level 2 standard to ensure maximum protection