Project - What the Shell! Scottish native oyster restoration 10% of profits from our Oystercroft merchandise will be going to purchasing native oysters to place in our local Scottish seas. Oysters are the lungs of the sea each one filtering 100-200 litres of seawater everyday! As natural oyster beds grow they provide an infrastructure allowing the creation of communities and increased biodiversity on the sea floor. By purchasing this hat you will be placing approximately 15- 20 oysters to live wild, cleaning Scottish seas.