Rapha's Trail Windblock Jersey is ideal for shoulder season rides when you want a bit more warmth than the T-shirt you've been wearing all summer. But this is more than just a long-sleeved tee. The main body is made from a merino blend fabric that is tough, wicks well and has a great warmth-to-weight ratio. It is overlayed on the front with a windproof nylon fabric that blocks out the wind when you're hooning it downhill. The sleeves are made from a super tough synthetic fabric and the jersey even comes with a repair kit in case you somehow manage to put a hole in one of the arms. The cut is mountain bike specific too, so you won't have to deal with any uncomfortable bunching up or restriction of movement.