Life jackets: U.S. Coast Guard rules for kids, Japan's sakura mark and boat rule, and how to check the fit

A life jacket is the single piece of gear most likely to decide whether someone survives a fall into water. U.S. Coast Guard (USCG) boating statistics: where cause of death was known, 76% of fatal boating incident victims drowned, and where life jacket (PFD) use was known, 87% were not wearing one. Japan's Coast Guard reports the same pattern. Here's what both countries' rules and guidance say.

U.S. rules and advice

• Under federal rules, on a vessel that is underway, "children under 13 years of age must wear an appropriate U.S. Coast Guard-approved wearable life jacket unless they are below deck or within an enclosed cabin." Where a state has a different requirement, the state rule applies on its waters.
• "The USCG recommends wearing your life jacket at all times when the boat is underway."
• "Adult-sized lifejackets and buoyancy aids may not work for children." A good fit won't let the jacket rise above the wearer's chin or ears.

Japan's rules

• The sakura mark. Life jackets that meet Japan's national safety standard carry a cherry-blossom "sakura" mark, showing they passed type approval and inspection.
• Mandatory on small boats. Since February 2018, everyone outside the cabin on a small vessel in Japan must wear an approved life jacket, and the skipper is responsible. Violations add penalty points to the skipper's license. Non-licensed rowboats and canoes are exempt from the approved-jacket requirement.
• The numbers. Japan Coast Guard: in 2025, among people who fell overboard, 11% of those wearing a life jacket died or went missing, versus 50% of those without one.

Fitting kids (Japan's guidance)

• Choose one that fits the child's size, and tighten the belts and the crotch strap.
• Lift the jacket by the shoulders to check it doesn't ride up.
• Japan's consumer agency warns that inflatable arm rings are not life-saving devices.

Our suggestions

• Buy life jackets for each child's current weight, and re-check the fit every season.
• If you rent a boat or join a fishing trip in Japan, look for the sakura mark.
• Practice floating in a pool. See "Water competency" and "Rip currents."

A Japanese version is available: "ライフジャケットの選び方と着け方" (in Japanese).