How wide should the slit in the handle of a fire shelter be?

The slit in the handle of a fire shelter should be designed to accommodate the width of the head. This allows for proper access and secure handling of the fire shelter when deployed in an emergency situation. A slit that is too wide may compromise the structural integrity and functionality of the shelter, while one that is too narrow could impede the ability of the user to effectively utilize the shelter, particularly under stress during a wildfire event. Ensuring that the slit matches the width of the head provides both safety and ease of use, allowing for quick and effective protection when needed.