Bionic Flex Knee ProtectorsExtremely lightweight, durable and flexible protector constructed from a breathable stretch mesh for a comfortable, close fit Elasticated top strap for a customizable fit Highly convenient and time saving slip design with elasticated hems and silicon printing to prevent slippage and to help keep the protector securely positioned Nucleon Flex Technology protectors are highly perforated and secured on the outside of the sleeve for excellent