SIORO mens underwear use high grade Lenzing Modal: Mainly composed of beech wood pulp that is made into cellulosic (or plant-based) fibers. Compare to
SIORO Men's 4Packs Trunks Underwear Soft Lenzing Micro Modal Breathable Everyday Boxer Briefs with Ball Pouch, Small, Light Blue
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SIORO Men's 4Packs Trunks Underwear Soft Lenzing Micro Modal Breathable Everyday Boxer Briefs with Ball Pouch, Large, Light Blue