Leatt has developed this enduro / motocross jersey that will allow you to stay warm during the coldest days, without however restricting your movement with something too heavy or bulky.
Use Warmyarn for the chest, arms and sides and then IceYarn for the back.
WarmYarn has water resistant padding and a 3D inner fabric for thermal regulation that is made from coffee grounds!
IceYarn has the same assets, coffee grounds, but is breathable to help you control your temperature by wicking moisture.
It has a classic fit that will work with or without the protectors and has overlock seams for added comfort.
If you want a motocross jersey with increased ventilation in both fits (full stretch or classic), check out the 5.5 Ultraweld model or the 4.5Lite.