Volcom sunglasses are made from Rilsan® Bio-Plastic. Rilsan® is created from a family of high-performance polyamides derived from renewable castor oil feedstock. The castor crop is inherently drought resistant, requiring very little irrigation or fertilization. As a result, it can grow in arid regions where and can be sustainably farmed. Rilsan® is lightweight, renewable, recyclable, durable - a winning combination!