I say experiment because I have known of these items for years and at last decided to try them. They are Grip Puppies. These things fit over the standard grips in a bike and do a number of things, they make the grips thicker and more comfortable and they add padding so that vibrations are damped when wearing thin summer gloves.
I bought them from ebay LINK, and they were here within a few days. They take 10 minutes to fit over the existing grips with a little soap and water and then are left to dry.
I went out for a ride with them fitted and was instantly impressed with the feel of them.
My wife likes them too so another set will be ordered for her ST2.