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The adjustment strings of life vests for recreational purposes (such as snorkeling or water activities) or simple life vests can only be adjusted in front of one's chest and crotch in addition to choosing size that fits one's figure.
Life vests can support people on water by buoyancy. People sink due to gravity, and life vests and strings make people uncomfortable and have difficulty moving around.
The hollow design of the product increases the convenience of moving around besides discharging water rapidly. Recreational life vests have secret pockets in which one can put his personal belongings, and they have the function of crying for help.