unseen syntax: struct::template X

Question

I stumbled over a piece of code that I do not understand. In one file:

namespace traits {
  template <typename... Base>
  struct use_ : Base... {
  };

/* some more stuff here */

  using useDefaults = use_<>;
}

and in another file:

template<typename T>
using InputHandle_t = typename Traits::useDefaults::template InputHandle<T>;

What I do not understand the useDefaults::template something syntax. What does this do?

PS: If I did not give enough context to understand my problem, please let me know!