Fox Base FrameWhether you're riding technical trails littered with chunky rock gardens, or high speed bike park runs, it's nice to have some body armor to protect yourself from unexpected tumbles. Meant to be worn under your jersey, the Fox Base Frame shelters your upper body from impacts while allowing unrestricted movement on the bike. It's suitable for downhill, freeride, enduro, or any trail where some extra protection brings much needed peace of mind.