1, strong adaptability: Sadai vest's front slit design can adapt to different body types, and it can adapt to different bust and waistline by adjusting the position of buttons or zippers, while Sadai vest's side slit design is not suitable for some people with special body types, and the position and size of the side slit can not fully meet the needs of people with special body types.

2. Good fixity: The front opening design of Sadai vest can fix the position of the vest through buttons or zippers, which makes the vest closer to the body and not easy to slide or move, while the side opening design of Sadai vest will cause the opening position to move or the vest will slide due to activities, which will affect the fixing effect.