Reseve memory for inner vector in a std::vector

I like to reserve memory for the inner vector in a std::vector<std::vector<TYPE>>, in order to avoid a lot of single memory allocations during a subsequent push_back. I don't know the innerSize of the vector exactly, but I can give a good estimate.

std::resize can be used as

vecs.resize(outerSize, std::vector<TYPE>(innerSize));

where outerSize and innerSize are given ints. This does not work for me, because the default constructor is not applicable. However std::reserve does not provide an interface like this.

Is this a good way to reserve memory for all inner vectors?

vecs.resize(outerSize);
for (auto &elem : vecs) {
    elem.reserve(innerSize);
}