No. it's all rubber with a nylon braid.
Good rubber too, like the rubber used to make the High Heat solution hose.
Good rubber made by the same people who helped solve the Black Death problem years ago.
I'm not hearing any issues with High Heat.
Cool Flex was made to appeal to those guys who switched to Parker Parflex cuz they didn't like steelbraid.
Problem with Parker Parflex is that not many cleaners like the way it handles but they just didn't have a choice, either light & coily Parker or heavy & hot steelbraid. Now they have a choice - a hose right in the middle - light & flexible yet can take the heat & pressure needed for steam cleaning. Cool Flex is off to a good start ... just in time cuz Parker Parflex is going way up in price. Now all we need is more pros giving it a thumbs up.
Gators work well with this hose too.
I'm probably gonna start carrying their other rubber hose products.
Look at any good garden hose, the ones that last. They have rubber in them, not plastic. Good rubber.