In addition, couple of other things. 1) make sure your wrist isn't cocked, that traps the nerve and adds to numbness, keep your wrist so your hand extends straight from your arm, 2) alter your hand position often. 3) ride one handed or no handed periodically, 4) ride split fingered on the hoods for a bit, so you take pressure completely off your palms. 5) loosen the death grip on the bars.