Extending the riding comfort from the base level Impact Liner, the Zoic Ultra Impact Liner last up to four hours in the saddle per ride. As an independent liner short, it's clutch when you don't want to be tied to a particular style of outer short/liner combo. And the Zoic Ultra Impact Liners transitions well from Zoic outer shorts or another favorite pair. The thighs and hips are protected with identical padding compared to the base level Impact.