Invisabelt Invisibelt, also known as "Invisabelt" is a special belt designed to ge rid of bulge from bulky belt buckles. This flat, undetectable and adjustable belt instantly gives you a sleeker, slimmer look! Invisabelts adjust like a bra strap and will always give you a great fit, even if you are in between belt sizes. When worn under your shirt, Invisabelts lay so flat and smooth that they go unnoticed. Invisabelts make great gifts for women of all ages, come in many styles and colors, and we even have a special Invisabelt just for girls!