I just completed a 4088km ride this august. Normally my right hand will start to tingle and go numb after a hour of so. I came across this product and thought it may help my sciatica. I have a very poor back, # one reason I researched and bought the upright riding Versys. I did not have one issue with numbess in my hand on my tour. The airhawk worked great. I will use every time I plan on riding more then hour. They are not cheap, but well worth it if you are planning a long ride.