Which makes more sense in American English?
The non-restrictive relative clause:
The bed has a thickness, which may be adjustable.
versus the restrictive relative clause:
The bed has a thickness that may be adjustable.
The use of the word
may suggests to me that it is non-restrictive, however, I feel like it is more correctly written as a restrictive clause. Are both acceptable, and if so, how do their meanings differ? The meaning I desire, is a bed with a thickness, that may or may not be adjustable (i.e., the bed's adjustability is not determined).
These sentences don't make much sense, that is because I took a much longer sentence and both genericized it and stripped it down to the the portion that applied to my question. I think the key point is if the relative clause contains words like
could that make the clause optional, does it make sense to ever use the restrictive clause?