These are genuine US military surplus KneePads (a set of 2) in ACU Digital. They are designed for the to sit over top of the knee and secured in place with the two elastic Velcro straps.
These knee pads are made by various manufacturers including ALTA, BPE, and McGuire-Nicholas.
These knee pads have been previously used and issued by the US military and are in very good condition. They will show minor signs typical of use including some dirt and scratches.