Mainly by glue, it won't hurt when you take it off. Poor quality occasionally has glue stuck to it, but it is easier to clean.

As for whether it is allergic or not, it depends on your skin condition. You can buy anti-allergic ones.

Generally, those with better quality will not fall off, and those with average quality will be loose if they sweat or move too much. If it doesn't fall off, it may be deformed.

From the appearance, it is not much different from wearing a normal bra. As for the feel, it depends on the material. The feeling of using high-grade silicone is more real, because breast enhancement is also made of that material. Because the invisible bra is generally for the convenience of wearing some low-cut clothes without revealing the traces of the bra, it is not the illusion of not wearing underwear, so the feel is not an important consideration for the invisible bra.

Online shopping is the main channel, and there are many for sale in the market. In summer, there are basically stalls selling underwear in Beijing, with uneven grades. Personally, I think it is better to choose a brand, at least 100 yuan, and the service life of dozens of dollars will not be very long.

Finally, in my personal opinion, I think it's best not to use that thing. Now there are many underwear styles suitable for summer exposure, which are very beautiful. The material of the invisible bra is airtight, which will have some bad effects on the body and skin.