They're incredibly uncomfortable, and they don't work any better than a control top panty or panty hose. I don't wear one. I tried one several years ago in a previous life, and threw it away after one wearing.
I've been on hormones long enough that there's hardly anything left to "tuck" anyway. Almost any panty will keep things buried.
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Diana
"The opportunity of a lifetime must be seized within the lifetime of the opportunity" Leonard Ravenhill