There's built-in liners and there's built-in liners. My expensive Nike shorts, with the longer cut for modest gents such as myself, have a soft silken liner that is very easy on the old chap and his spherical companions. My cheapo Aldi shorts are also long enough to prevent leg chafing ... however .... the liner is comfy enough but somewhat coarser material. Which means that when I got soaked in a downpour they clung and, ahem, scraped and chafed a little. A lot, actually. I did not enjoy the shower afterwards.