Worth pointing out that it's not just the hands, but compression at the subclavian artery (artery that gets squished between collar bone and first two ribs when we hunch forward from cold or poor riding posture. people walk around banging and shaking out their hands, when if you just get em to stand up straight and lift their collar bone up off the neurovascular bundle that feed the arms, their hands turn pink and come back so much faster. Wear a smoking hot suit in the first place and you wont hunch your shoulders up around your ears, negating half the problem.

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The hunting reflex is great. you just rig with bare hands, and go stick em in the lake for a good minute so they get real cold, then go get your wetsuit on and let them warm back up to beet red, then ride and they will be warm for hours.