Type II life jackets are designed to do what for some unconscious wearers?

Type II life jackets are specifically designed to help keep some unconscious wearers in a face-up position in the water. This is crucial for survival, as being face-up allows the wearer's airway to be above the water, reducing the risk of drowning. These life jackets provide buoyancy and are more effective in stable conditions, making them a practical choice for calm waters and for activities such as fishing or boating.

In contrast, while comfort and warmth can be beneficial features of life jackets, they are not the primary functions of a Type II design. Additionally, saying that Type II life jackets are not suitable for use in water does not accurately represent their purpose; they are indeed suitable and intended for use in aquatic environments. Therefore, the defining characteristic of Type II life jackets is their ability to assist certain unconscious wearers by keeping them face up, ensuring safety and increasing chances of rescue.