4mm - 155 x 61mm (at the longest and widest points)

or the ischial branches that bear the load in the sporty sitting position

at just 135-grams

The bottom side of the mount is left open to fit a GoPro

Fox Defend Race Youth Long Sleeve Jersey - Youth S - Black eBay 4mm - 155 x 61mmThe Fox Defend Long Sleeve jersey is for those who like to get wild on the trails. This jersey has excellent airflow with the aid of TruDri Fabrics and large mesh panels to help keep sweat away. Strategically placed abrasion resistant zones help to keep you protected during those inevitable crashes and tumbles. Who's this item for: Perfect for aggressive Trail, All Mountain and Enduro Riders. It's targeted towards people chasing a breathable and