The Opti-Free Express Twin Pack is a multi-purpose solution which ensures your contact lenses stay healthy & comfortable for longer. The unique ingredients contained within the formula help to promote a more efficient cleaning process & lasting comfort, whilst providing an enhanced disinfection process, to remove unwanted bacteria & material. Opti-Free Express provides an superior cleaning process in one single solution, without the need for a separate enzyme or protein remover. This Twin Pack contains enough solution for two months of cleaning.