"Statically sized" or "Static-sized" buffers?

I mean to say that the size of the buffers is fixed and won't change. I wonder wich way is more appropriate.

For example:

"Our approach employs statically sized buffers to avoid the overhead associated with resizing."

Solution 1:

You can either use "static buffer(s)" or "fixed-size buffer(s)". Technically, Fixed Size buffer is more appropriate and widely used.

"Our approach employs a static sized buffers to avoid the overhead associated with resizing."

"Our approach employs a fixed-sized buffers to avoid the overhead associated with resizing."