My understanding is the Freeride Jersey is really just a Tech Tee pattern which uses a fabric more like a jersey.

How the manufacturer explained this:
In the past we have called a short sleeve DH jersey a “Freeride jersey” but that is not appropriate anymore with today’s style of riding with “earn your turns” shorter travel bikes. To that end the Freeride jersey has morphed into our tech tee pattern with the DH fabric.