Designed to be worn either as a mid-layer or as an outer jacket in its own right, the Thermoball is a nifty bit of kit.
The synthetic down The North Face have used as insulation is comparable to the real thing in terms of warmth and ability to pack small.
But it has the distinct advantage that it far outperforms down in the wet, making this a supremely versatile piece of kit.
£170, blacks.co.uk
