Mass. Gen. Laws ch. 90B, § 5A: Wearable personal floatation devices

Section 5A. Every vessel not subject to section 5, including, but not limited to, unpowered vessels such as canoes, kayaks and stand–up–paddleboards, shall carry at least 1 United States Coast Guard approved wearable personal flotation device of appropriate size and type for each person on board in good and serviceable condition in a readily accessible location and additional personal flotation devices as the director may deem necessary. Each amphibious landing vehicle shall have at least 1 United States Coast Guard approved wearable personal flotation device of appropriate size and type in good and serviceable condition that shall be in a readily accessible location for each passenger under 10 years of age. This section shall not apply to vessels used in competitive rowing, sculling or supervised intercollegiate sailing programs, rafts, surfboards, sail fish or any similar type of vessel.