For the mesh material of the G-Iduna Oyster model, we use a yarn that is largely made from oyster shells. Here we crumble the shells, down to powder size, liquefied and mixed with a little binding substance. Yarns can be made from this raw material. Oyster shells are an underrated waist problem because they don't rot. In Taiwan alone it is more than 160,000 tons each year. Although some of the oyster shells are used for soil improvement or food pellets for livestock but the problem has not been solved because the nutritional value is very low. Oyster shells that are processed into yarn and into textiles or shoes are beneficial to human health. We thank the ocean for this valuable resource, use it optimally and give it greater added value.