Why Soy? Because it's so Clean!  I burned the candle  on the right from the very top and look how  spectacular the jar looks!

Paraffin candles are petroleum based and tend to leave a build-up of black film on the jar and sometimes, especially with lower-grade waxes, on walls, ceilings, drapes and furnishings.  The soybean candle produces little to no soot.

It generally burns at a slower rate than other candles.  The burn pool is even.

The soybean candle contains no carcinogens or toxins.

The soybean is an agricultural product and is thus considered a "renewable" resource.  Soybean wax is super thick hydrogenated oil:  bad for your arteries, but good for your environment.

Soywax is easily cleaned as it's water soluble.

Read more about soy candles:  USA Article