The US-based company, Thinx, has developed machine-washable underwear for women that can be used during menstrual periods to avoid leakage.

Thinx come in various styles and boasts anti-bacterial properties. The first is for light days, the second for medium days and the third for heavier days. For those with heavy flow, you might need to wear it with ordinary sanitary napkins, but because they can absorb up to two tampons of menstrual blood, they give confidence against leakage.
As the company slogan goes “only you know your flow”. The absorbent underwear is machine-washable and stain-resistant and can hold as much liquid as a standard pad.
For women in developing countries, the company will also donate a reusable menstrual pad every time you buy an ordinary pad, through the non-profit organization, AFRIpads. The product will be shipped to countries outside the US.
Source-Medindia