Smooth under tight shirts, 181 is one of our best selling bras. 181 is fully functional with tight clothes, low cut blouses, and strapless tops. This bra is a plunge cup tailored Microfiber Tactel bra with removable push up pads. If you have not tried clear strap bras yet, 181 is a good place to start. We have the clearest straps on the market and they hold up well if you are a little nice to them.