Just having a support bar is really bad. You can get significant flex before it offers the resistance you need. It would be really useful to have multiple supports or less flexible fabric that could handle the tension with a single hoop. It's pretty comfortable, but if you wear it for too long it will almost certainly get hot. Does not absorb moisture in any way. I wouldn't want to sleep in it, but I find it useful as a fallback for travel boosts. I would not recommend multi-tire versions at similar prices.
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