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The boards are being heralded as “the most sustainable in the world to date” and two will be surfed by professionals in the Rip Curl Eco Tag Team Contest during the festival.

Every year approximately 750,000 surfboards are manufactured worldwide. The vast majority of these are made from oil-based plastics with little thought to the environmental impact of either their manufacture or disposal at the end of their life.

Eden has been working on its eco board project for four years with the ultimate aim of seeing all boards manufactured using sustainable materials and processes.

The latest boards on show at the Rip Curl Boardmasters have been made with Cornish companies Homeblown and Sustainable Composites. They are lightweight, with a 36% plant-based foam blank (core of the board) laminated in fibreglass cloth and covered in 98% plant-based resin.

Chris Hines, Eden's Sustainability Director and head of the eco board project, said: “Last October we stated that the term 'eco surfboard' wouldn't exist in ten years time as all boards will be manufactured sustainably. This is now rapidly becoming a reality.

“We are clear in our aims that eco products must be as good if not better than normal products in terms of performance, weight, and durability. They must also be cost competitive.

“The pace of progress is brilliant. The Portreath Valley in Cornwall is the sustainable surf equivalent of Silicon Valley in the USA."

The Eden eco board project started when some balsa trees were felled in the project's Rainforest Biome and Chris Hines and his colleague Pat Hudson, Eden's Waste Neutral Supply Chain Coordinator, decided to try and make the world's most sustainable surfboard.

It was a 9ft balsa board laminated in hemp cloth and 40% plant resin. The board was produced by a team including Homeblown, Sustainable Composites, board shaper Chris Jones and Ocean Green, who supplied the hemp cloth. It is permanently on show in the Biome where it grew.