Featherlite smock
Trail Rating 4/5
 
The lightest wind shirt in the world ideal for running and biking, however equally at home doing any outdoor activity where lightweight kit is required.  It will fend of light rain and take the sting out of the wind, at 100grms you'll hardly realise that you are wearing it.  The simple design has a zip collar to allow a little airflow, the cuffs are elasticated to keep the wind out but can be pulled up if needed.  The elasticated hem keeps the wind out and the drop tails gives extra protection.  There are a couple of reflective dots.  It comes with a fist sized stuff sac for easy storage.
 
For the weight it's harder to find a product more useful when running.

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