Every summer, between May and August, teams of harvesters move through the forests of southern Portugal carrying a single curved axe. They work fast, often in heat well past 30°C, cutting wide sheets of bark away from cork oak trees that have stood in the same ground for decades. By the end of the season, the trees are left bare-trunked and pale, and completely unharmed. Within a year, a new layer of bark starts to form, and the same tree won't be touched again for roughly nine years.
It's a remarkable way to gather a raw material. It's also where the story of a cork mat actually begins, long before it becomes part of anyone’s practice.
What is Portuguese cork and where does it come from?
Cork comes from the bark of the cork oak, a tree that grows almost exclusively around the western Mediterranean. Portugal holds more of it than anywhere else on earth. According to the Portuguese Cork Association, the country's cork oak forests, known locally as the montado, cover around 700,000 hectares. Together they retain an estimated 14 million tonnes of CO₂ every year and provide a habitat for 37 different types of animals, making the montado one of Europe's richest ecosystems. A cork oak's average lifespan is around 200 years.
The montado doesn't look like the dense woodland people often picture. It's closer to a wooded savannah: cork oaks spaced widely apart, with wild herbs, grazing land and other tree species filling the ground between them. That spacing isn't decorative. Each tree needs room to grow a broad canopy and a thick trunk, since a tree needs to reach a certain size before its bark can be harvested.
Harvested by hand, never felled
A cork oak has to be around 25 years old, and its trunk needs to reach a certain size, before its bark can be harvested for the first time. After that, the bark can be harvested again roughly every nine years, for well over a century.
What makes the process so distinctive is that harvesting the bark doesn't harm the tree. It's carefully removed by hand using a special axe, rather than machinery, as the harvesters need to separate the outer bark from the living layer underneath without damaging it. The tree is left standing, its bark grows back, and around nine years later, the process begins again.
Very few natural materials are gathered in this way. The tree isn't cut down or replanted, and the same cork oak can continue producing cork again and again throughout its long life.
A material that regenerates
That ability to regrow is an important part of cork's story. Because the same trees can continue producing bark throughout their lives, cork farming gives landowners a reason to maintain the montado rather than clear the land for other uses.
In turn, this helps preserve the forests and the wide variety of plants and animals that depend on them.
From bark to surface: How cork becomes a yoga mat
Raw cork bark, fresh off the tree, is thick, uneven at the edges and full of natural variation. It looks nothing like the smooth surface you experience on a finished cork mat. Getting from one to the other means drying the bark, then shaving or grinding it down into thin sheets or granules that can be pressed into a consistent, workable surface.
On its own, though, cork is too light and too rigid to sit flat and stay securely in place during use. A cork yoga mat is never a single material. It's a construction: a cork top layer bonded to a base that gives the mat weight and grip.
ThriveLiv's mats follow the same principle, pairing a Portuguese cork surface with a natural rubber base, so the mat has enough substance to stay grounded throughout a full practice rather than sliding underfoot.
Why is cork a good surface for a yoga mat?
Cork has a naturally warm, lightly textured feel under hands and feet, giving it a noticeably different character from smooth synthetic surfaces.
Its cell walls also contain suberin, a naturally occurring waxy substance that helps the tree protect itself against moisture, pests and decay. These natural properties make cork a practical surface for something that regularly comes into contact with hands, feet, skin and sweat.
Cork also behaves differently from many synthetic surfaces when it gets damp. Rather than becoming more slippery, its grip tends to improve as moisture builds, making it particularly well suited to warmer or more active sessions. And as a natural material, cork doesn't have the synthetic smell or contain the phthalates commonly associated with PVC and some other plastic-based mats.
Bringing it back to the mat
The material underneath you doesn't define your practice. But it does mean the surface you choose doesn't have to be an afterthought, or a trade-off between how a mat performs and what it's actually made from.
A ThriveLiv mat carries all of this in it: the montado, the harvesters working through the heat of a Portuguese summer, and the same tree returned to every nine years rather than felled once.
You can read more about how that shapes our approach to materials, or go straight to our current range of cork yoga mats to feel it for yourself.
Portuguese cork yoga mats: FAQs
Does a cork yoga mat get slippery when wet?
Cork's grip tends to increase as the surface becomes damp, making it particularly well suited to warmer or more active practices where hands and feet may become sweaty.
What are ThriveLiv cork yoga mats made from?
ThriveLiv mats pair a Portuguese cork surface with a natural rubber base. The cork provides the natural surface of the mat, while the rubber base gives it the weight and stability needed to stay grounded during practice.
How is cork for yoga mats harvested?
Cork is harvested by hand from the bark of mature cork oak trees without cutting the trees down. Once harvested, the bark regenerates and can be harvested again roughly nine years later.
