What Is Crimsafe®? Crimsafe® is a stainless steel security mesh and frame system that is used to secure windows, doors and outdoor areas that are at risk for intruders and insects. This product is known for looking like an insect screen from a distance. It is also great for keeping mosquitos out of the house on days when you want to let the fresh air flow through. But, Crimsafe® is not like any ordinary insect screen, it makes your home practically impenetrable to thieves or intruders.