Alpinestars has created the Paragon Protective Short Sleeve Jersey to serve two purposes. First, it's a stretchy mesh jacket that comes with a CE-certified back protector. When you need to, this protector can be swapped out for a hydration reservoir when long days in the saddle call for more water than protection. The back panel has dual cutouts so you can direct the hose either over your shoulder or under your arm. And the front left shoulder has a tube loop to ensure the hose stays where you can reach it.
The Paragon's stretch-mesh body fabric is designed to sit close to your skin, the better to slide comfortably under a jersey. The shirt is also extremely lightweight and breathable, so it won't weigh you down or trap sweat. And it conceals two padded side pockets designed to hold small gear like gloves or a multitool. An integrated, padded zippered pocket at the back holds your phone.