There are lots of trail tees out there, but most seem to not really be made to ride in. The Castelli Trail Tee features a lighter-weight 100% polyester fabric for quick drying and excellent moisture management, with a 3D mesh construction that lets air flow through to keep you cool. No more feeling like you are riding in a plastic bag. And the fabric is Bluesign approved, so it's good for the planet. And because all the Unlimited shorts have pockets, you can complete the relaxed look and feeling of freedom with this performance trail tee.