To keep you properly insulated, the wrist cuffs should at least be adjustable. If they have a tight fit, that’s better than them being loose. You’re relying on the down filling to maintain and reverberate your body heat, but if it’s just leaking out of your wrist slots like smoke out of a chimney, the insulation will be slightly less effective.
This is also a good time to mention that the bottom of your jacket should either be an equally tight fit or at least have any exposed skin covered by your thermals/bottom layer. These are simple solutions to maintaining your body temperature in harsh conditions if you understand how to insulate yourself.