I just bought a 2nd pair today, hang on, I'll go look
95% modal, 5% spandex. Very comfy knit, and they are very long in the leg and sleeve
Hope that helps.
If your question was what is Modal...your guess is as good as anyone
ah...good old Goog
rayon
Modal is a type of rayon, a semi-synthetic cellulose fiber made by spinning reconstituted cellulose, in this case often from beech trees. Modal is used alone or with other fibers (often cotton or spandex) in household items such as pyjamas, towels, bathrobes, underwear and bedsheets.