I've been a GU fan for a decade......a couple of days ago i did a 57 mile run for my 57th birthday and a friend of ming who is sponsored by Powerbar dropped me off a dozen of these gels. They go down 1000 times easier than any other gel i've tried. They have a lighter density and I ended up doing two at a time in the last few hours of the run. I hate trying to get gel out of it's package when it's cold. these things are a dream!!!!!!