Validated at the extremes
Mission: Everest
KarmaCane, our patented biopolymer, powers eyewear that has been tested in extreme conditions, including Mount Everest.
The expedition
Sustainable Choice
In May 2025, four former special forces soldiers travelled from the UK to the summit of Everest and back in under seven days, wearing sunglasses made from KarmaCane, Teysha's patented sugar-derived biopolymer.
The products withstood sub-zero temperatures and intense UV, while offering a safe and certified biodegradable end of life. The expedition also supported Scotty's Little Soldiers, the charity for bereaved military children.
Conditions performed in
Sub-zero temperatures
KarmaCane components performed at extreme altitude without becoming brittle.
Intense UV exposure
Materials withstood high-altitude ultraviolet radiation without degrading prematurely.
Altitude and pressure
Products functioned in thin-air conditions above 8,000 metres.
What it proves
Conventional tooling
KarmaCane was processed on standard injection moulding and extrusion equipment.
Real-world durability
The expedition showed that biopolymers can survive the harshest conditions on Earth.
Certified end of life
Despite its toughness in use, KarmaCane is certified biodegradable under OECD Test Guideline 310.
Proven
Certified biodegradable
Ultimate Biodegradability Classification under OECD Test Guideline 310, from an ISO/IEC 17025 accredited laboratory.