The phrase "more than comfortable" is correct and can be used in written English. It is often used to describe a situation in which one feels more secure or relaxed than typical. For example: "We felt more than comfortable with the idea of returning home again.".
But the handcycle was more than comfortable.
He's more than comfortable with it.
I'm more than comfortable bringing my son in here.
His professional expertise, he said, made him feel more than comfortable getting in the water.
With its x86 processors, Intel worked itself into a more-than-comfortable position as part of the Wintel ecosystem.
IN this more-than-comfortable hamlet, shoppers at the Chappaqua Village Market are passing up filet mignon and Delmonico for flank and skirt steaks.
Mr Farage, who started work just before the "big bang" in the City, earned a more-than-comfortable living, but had another calling - politics.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia