1.Direct force on the belt: the shoulder force is more smooth, and the force is stronger.
2.Back neck brace: a thrust that acts on the back and at the same time cushions and protects the neck and back.
3.Combined back support system: A set of fish bones and a set of small support plates from the outside to the inside, plus a main support plate to form a support system that gradually supports and protects the waist.
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