There's always micrometeorites in orbit, and they constantly hit the ISS. So my question is during EVA, how do astronauts protect themselves? Is their suit designed to take impact? Since there are micrometeorites that impact the ISS windows and can cause a crack, it seems unrealistic that the suit would provide any protection.
Essentially, they just accept the risk.
The suit is strong enough to withstand strikes from those micrometeoroids and pieces of orbital debris most likely to hit it, and it's small enough (and EVAs are short enough) that larger, more damaging strikes are quite unlikely.
The meteoroid and debris environments are only really understood in a broad average sense (weeks to years). Time scales as short as a single EVA are not particularly useful for determining an accurate level of risk.
Furthermore, the limiting condition for dealing with the unlikely-but-probably-inevitable strike is not going to be pressure loss, it's going to be crew injury, as any hole big enough to create a pressure problem is going to basically create a gunshot wound. As a result, the suit is designed to protect against strikes up to a certain size, beyond which an impact is quite unlikely.