Fine rib knit with a smooth mock-neck trim finished flat rather than fluted, giving it a cleaner, more minimal look than a lettuce-edge style. Hand wash cold or use a gentle machine cycle in a wash bag, and reshape the neckline and cuffs while damp to keep the mock collar sitting upright rather than collapsing. Avoid high heat in the dryer, which softens the rib's structure and can leave the mock collar sitting looser than intended, and store folded rather than hung to protect the set-in shoulder line. With regular gentle care, the fine rib holds both its shape and its close fit over repeated wears.