2.5mm thickness neoprene,with external side laminated Silver nylon jersey,internal side laminated Blue or Black nylon jersey.
Very soft and confortable. 2PCS each side metal springs help better support.
Home use without conduct a doctor.
Velcro fasten system for easy wearing.
Hole at the middle of it for better ventilation.
A small foam cushion leads to protector the bone on the knee cap.