Women in Brazil are using masking tape to get the perfect tan lines

Pilar Olivares/Reuters

The secret to a perfect bikini line ('marquinha' in Portuguese) is masking tape.

The INSIDER Summary:

• Erika Bronze Spa in Rio de Janeiro, Brazil, makes bikinis out of masking tape.
• The itsy-bitsy bikinis allow maximum sun exposure and create pronounced tan lines.
• A three-hour session costs about $20.

The secret to a perfect bikini tan line might already be in your toolbox.

At Erika Bronze Spa in Rio de Janeiro, Brazil, owner Erika Romero Martins uses masking tape to mold tiny, thin bikinis directly onto clients' bodies.

The results are perfect, clear-cut tan lines highlighted by sun-kissed skin.