Running tights offer unparalleled freedom of movement, and their close fit eliminates any risk of fabric bunching or dragging at your legs as you run. The downside is that they're also very revealing -- although choosing black tights can cut down on the exposure a little bit. What you wear under the tights is largely a matter of preference, although going commando is the only sure way to guarantee no visible lines or fabric bunching under the tights.
The Case Against Commando
The biggest objections to going commando under running tights -- for both genders -- are that seams get misplaced, the tights are too revealing and you end up having to launder your tights more frequently than you would if you wore something beneath them.
For the sake of modesty, you can wear loose running shorts over the tights. Wicking compression shorts under the tights offer some modesty, too, and also address seam concerns -- but for some runners, those shorts bunch uncomfortably beneath the tights. The same applies to boy shorts for women. Thongs leave no lines and have little fabric to bunch, but they aren't always comfortable. Whatever you end up wearing, shuck out of the damp tights and underlayers as soon as possible post-run to reduce your risk of rash or infection.
Some men's running tights include a windproof or insulated front panel to keep the genitals from becoming chilled. If you run in cold weather and your tights don't have such a panel, you can add windproof briefs or a strategically placed sock.
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