Modal and the Rayon Family
Rayon is a broader family that includes several regenerated-cellulose textiles. Modal is therefore not simply an unrelated opposite to rayon. Differences in processing and fiber fineness help explain the names encountered in product descriptions, while the construction of the finished garment still affects softness, weight, and the way the cloth moves.
A fine version of regenerated cellulose
Micromodal is a specialized modal textile associated with very fine cellulose-based fibers. The source links it with softness, moisture handling, and uses such as underwear, sleepwear, and sportswear. It is therefore a more specific term than simply saying rayon, even though the materials belong to the same wider family.

Why fineness changes the feel
The source explains that micromodal and modal use closely related manufacturing processes, with fiber size a key distinction. Fine fibers can create a smooth, soft fabric, but that does not mean every garment has the same construction or blend. When comparing related rayon textiles, pay attention to the exact fiber name as well as the type of cloth made from it.
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