https://phys.org/news/2019-01-slopes-bio-based-snowboards.html

Modern skis, however, are a little different. Generally, they have a core that is often wood, sandwiched between layer of composite material and finished off with a topsheet and a sliding base, which can be made from a variety of materials. And snowboards are very similar. The composite layers of skis and snowboards are normally made from plastic and carbon or glass fibres. But large companies are increasingly adding flax strands to the mix.

Over the last five years, flax fibres have become much more prevalent, according to Paul Sherratt of the Sports Technology Institute at Loughborough University in the U.K. This comes with a drive towards more sustainable products.