"comfortable size" is a correct and usable phrase in written English.
You can use it to describe a size that is neither too large nor too small for a particular item or space. For example, "This chair is a comfortable size for reading."
Despite the slanted roof line, the upstairs bedrooms are a comfortable size.
Both enable you to enlarge or shrink the print to a visually comfortable size.
"It's a comfortable size right now," he said, adding that as the meets grow more funds will be needed.
These Pompeian planes were of comfortable size, being about eight inches long and 2 1/4 inches wide.
Ideally two fighters would box each other at their most comfortable size and weight, confident they had not stripped away the excess too far or too quickly.
The architecture, if you have a small work, scales it up; and if something's really big, it scales down to a comfortable size".
Also make sure the bra is comfortable; sizes are not universal.
It seemed really comfortable: right size, right fit.
As improved optics gradually brought the camera obscura down to comfortable carrying size for artists and other professionals (even spies), larger ones were still built for public entertainment.
When you turn it on, you can drag a slider on the screen to select a more comfortable reading size for apps that take advantage of the Dynamic Type technology.
There are shoes that belonged to recent first ladies (only Betty Ford's silver sandals look comfortable); a size 20 from a woman who suffered from gigantism; Egyptian burial sandals dated 200 B.C., and white shoes adorned with a black star, formerly Ringo Starr's.
