The bottle is 25% Biobased and 75% RPET. Biobased plastics (also called plant-based) are partly made from a renewable resource such as sugar cane waste. RPET stands for recycled PET (plastic). PET is a strong, durable, and recyclable material. RPET is produced by collecting, sorting, and recycling PET, then refining the material into flakes that can be turned into new products. RPET can be re-used up to 5 times! The cap is 100% Transparent HDPE. The most environmentally friendly option. Transparent caps improve the recyclability and they do not require chemical colouring.