I get some numbness in my hands when I ride. This is from nerve/circulation issues that are most likely from riding 500k over the last 25-30 years mostly on sport bikes and sport tourers.

When I got my BMW R12002R water boxer, it came with heated grips (and every other gadget). I didn't think much of the heated grips. Funny thing...using them seems to increase blood flow in my hands and they don't get numb any more. Now, I keep the heated grips on (low) even on warm days, and it makes longs rides more pleasant.