I’m never going back to synthetics again. I absolutely love my natural brushes! First of all my horse is outside the most of the day and normally without rugs, so when it’s raining he need to have most of the natural grease that’s in the coat, and by my experience the natural brushes leaves more of that grease than the synthetic ones. And when I use the synthetic brushes I get static shocks from my horse when I touch him, and neither of us likes that..
(Excuse my English, hope you understand me anyway)