> Taking one on and off on aeropalnes and trains is easier if you have to do it once.
I simply grab hold of both cuffs and pull my arm out of both sleeves at once if I want to take off both fleece and waterproof.
Zip-in fleeces are pretty pointless, adding unnecessary weight and cost, leaving a cold strip down the front, and making the fleece a loose fit. Possibly okay for dog-walking, but pointless for outdoor use.