I have had a nagging problem with numbness in my left hand when riding long distances for the past few years. Nothing so severer to stop touring, and switching hand positions frequently has kept it at tolerable levels. I have wide cyclocross drop bars with extensions at the ends, so plenty of hand positions. The bars have gel padding under cork bar tape. I have tried gloves with various amounts of padding and no padding at all with little change in the occurrence of numbness.
I bought the Serfas RX gloves after losing of my gel padded gloves during my most recent tour. I picked out the RX gloves because they were the only pair that fit at the local bike shop in Astoria, Oregon. At the end of the first day riding with them I realized there were no episodes of tingling or numbness. Serfas has done their homework. The padding is not as thick and is significantly denser than on my old gloves they replaced.
I will add the caveat that cycling gloves are very personal, like saddles, shorts, shoes and pedals. What work for one person provides no guarantee of the results for others. So my five stars is a personal rating. Objectively they are well made, grip the handlebars well, seem to transfer sweat and moisture quickly, and overall function well. They come with some neat loops at attached to the finger ends to make is easier to take them off, or if you are like me and roll your gloves off from the wrists they make is easier to turn them right side out again. Problem for me is the loops have a tendency to catch on my cross brake handles so they are gone.