We're working out what we think - we'll add our view here!
Mountain Equipment says:
A lightweight and highly adaptable jacket for climbers and mountaineers.
The Arrow Jacket combines the wind resistance, wicking and warmth for days in the mountains with the unimpeded mobility required for contorted crux moves. Three zipped pockets keep essentials close to hand and a full zip allows fast layering.
We're working out what we think about Mountain Equipment's Arrow Jacket, we'll add our comments here in due course.