Which of the following is true about life jackets?

Life jackets are a critical safety device on any watercraft, and their effectiveness can be significantly impacted by how well they fit. A life jacket must fit snugly for safety reasons to ensure that it remains securely in place in the event of an emergency. If a life jacket is too loose, it can ride up and potentially slip off when in the water. A proper fit also means that the jacket will provide the maximum buoyancy and support needed to keep a person afloat and safe.

When it comes to the other options, it’s important to note that although life jackets are not legally required for adults in all situations, wearing one is strongly recommended and is often necessary depending on the boating conditions. Additionally, while life jackets can indeed be worn over layers of clothing, it's crucial that these layers do not compromise the fit and effectiveness of the jacket. Lastly, although children are often mandated to wear life jackets while on a boat, the necessity for life jackets extends to all boaters, regardless of age, emphasizing the universal importance of safety on the water.