Same material as the sunshade in the sunroof, they just fit the back two side windows of the MC/MCS. No need to velcro, though it's provided. Comes with a storage bag. $65 shipped lower US, or less if SF Bay pickup/deliver.

 

Here's a pic... (It's just the sides that are for sale, the one for the hatch is a separate piece which I don't have a spare to sell.)

(2) side shades (one for each side of the rear window)
(1) MINI sleeve/bag to hold shades
(1) pack of velcro