The CS ThermoShield / CS Tech Fleece Jacket is the perfect Spring and Fall jacket.  The entire jacket is made from our exclusive CS Tech Fleece material except for the front upper chest area which is made from our exclusive CS ThermoShield fabric.  The ThermoShield fabric is 100% windproof.  When would you use this jacket? On days when a heavy winter jacket might be too much but a lightweight jacket is not enough.  The CS ThermoShield fabric keeps the wind off your chest while the CS Tech Fleece allows the rest of the jacket to breathe.