At the 2023 Berlin Health Expo, German startup GreenSteam unveiled a game-changer: biodegradable polyester felt sauna hats designed to reduce winter wellness waste. Made from 70% recycled PET bottles and plant-based binders, the hats decompose within 5 years—a stark contrast to conventional polyester’s 200-year landfill persistence.

“Winter sauna culture shouldn’t harm the planet,” says CEO Franz Becker. “Our material withstands 120°C heat while cutting carbon emissions by 40% during production.” The hats’ textured surface mimics wool felt’s breathability, addressing complaints about synthetic materials trapping sweat.

Environmental groups applaud the innovation. “Globally, sauna accessories generate 8,000 tons of waste annually,” says Greenpeace’s Anna Müller. “Switching to recyclable polyester could revolutionize winter wellness industries.”

Priced at €25, the hats target eco-conscious European markets. Early adopters in Denmark report no performance gaps: “It feels like regular polyester but guilt-free,” notes a Copenhagen user. Competitors like EcoSauna are racing to launch similar lines, signaling a shift toward sustainable winter gear.