Cork
Cork is made from the bark of cork oak trees, cork bark is hydrophobic making it ideal for use in the sea to repel water. The trees can only be manually harvested once every nine years.
Once a cork oak tree has been stripped of it's bark, it absorbs 3-5x more C02 than usual. During the life of the tree there is no need for things like fertilizer, pesticides, or pruning. This results in the cork having a minimal carbon footprint.
We use the cork specifically to add a bit of extra volume to the boards giving a bit more flotation and to give you a super soft and grippy surface.