It’s built to be worn all the time and are supposed to be designed more comfortable while allowing better movement.
A big part of the floatation on the back is located high so it doesn’t interfere with your boat seats back .
I have an auto inflate but would feel better with one that doesn’t need to inflate to hold me up .
Also , if you have an auto inflate ( in my state) it must be worn to qualify as a flotation device . If you get hot you could be ticketed if you take it off while on the water .
With a kayak flotation device or any regular floatation device , you are legal as long as the floatation device is in your boat . It doesn’t have to be on your body .