Micro modal fabric is made from the cellulose of beechwood trees. It’s a type of rayon, meaning it starts as a natural plant material but goes through chemical processing to become a soft, lightweight textile fiber. The beechwood is primarily harvested from managed forests in Europe, then broken down into wood pulp and chemically converted into ultra-fine fibers that are softer and more absorbent than cotton.
From Beechwood to Fiber
The process starts with harvesting beechwood and chipping it into small pieces. Those chips are processed to extract cellulose, the structural compound in plant cell walls, and ground into a white, solid wood pulp similar to what’s used in papermaking. This is the raw ingredient for every micro modal garment.
To turn that pulp into spinnable fiber, manufacturers soak it in a sodium hydroxide solution to create what’s called alkali cellulose. After aging, this material reacts with carbon disulfide in a step called xanthation, producing a thick, deep orange liquid. That liquid is then forced through a spinneret, a device with thousands of tiny holes, into an acidic bath. When the solution hits the bath, it solidifies into individual filaments. These filaments are gathered, stretched, and spun into yarn.
What makes micro modal different from standard modal is the size of those filaments. Micro modal fibers are significantly finer, which is what gives the finished fabric its distinctively silky hand feel. The finer the individual fibers, the softer and more drapey the resulting textile.
How It Compares to Cotton
Micro modal is roughly two times softer than cotton and absorbs about 50% more moisture. That combination of softness and absorbency is the main reason it became popular for underwear and base layers. The fibers wick moisture away from skin efficiently, keeping fabric from feeling damp or clingy during activity.
Unlike cotton, which can feel stiff or rough after repeated washing, micro modal tends to maintain its softness over time. It also resists the kind of shape distortion that cotton knits are prone to, holding its fit through many wash cycles.
Where You’ll Find It
Micro modal first gained attention in men’s underwear. The Austrian company Lenzing AG developed the fiber, and its combination of lightness, breathability, and softness quickly made it a go-to material for premium undergarments. It expanded rapidly into women’s underwear, bras, and nightgowns.
Beyond intimates, you’ll find micro modal in loungewear like pajama pants and hoodies, where its drape and softness make it feel more luxurious than standard cotton fleece. Bikers, hikers, and other outdoor athletes often choose micro modal T-shirts for the moisture-wicking performance. It’s also used in baby clothing and bed sheets, both applications where softness against skin matters most.
Environmental Considerations
Micro modal occupies a middle ground between fully natural and fully synthetic fabrics. The raw material, beechwood, is renewable and typically sourced from sustainably managed forests. Beech trees also require relatively little water and no irrigation to grow, which gives the fiber an advantage over cotton farming.
The chemical processing step is where the environmental picture gets more complicated. The production involves sodium hydroxide and carbon disulfide, both of which can be harmful if released into the environment. Lenzing, the primary producer, uses a process designed to recover and recycle these chemicals rather than discharging them. The modal fibers they produce have modifications to the spinning solution and process settings that give the finished fiber higher wet strength compared to standard viscose rayon, making the garments more durable and longer-lasting.
Caring for Micro Modal
Micro modal is easy to maintain if you follow a few guidelines. Wash it on a gentle cycle in cold water with regular detergent. Never use chlorine bleach, which breaks down cellulose-based fibers and will weaken the fabric over time.
For drying, use low to medium heat and pull items out while they’re still slightly damp. This reduces wrinkling and prevents the kind of heat damage that cellulose fibers are vulnerable to. If you need to iron, place a pressing cloth between the iron and the fabric. Extremely high temperatures can scorch plant-based fibers, leaving permanent marks. With proper care, micro modal garments hold their shape, color, and softness through many cycles, which is one reason the fabric has developed a reputation for outlasting comparable cotton pieces.