Most listings show machine wash and tumble dry as the default care. Some kids' styles specify machine wash cold and tumble dry low. Follow the garment's care label for any variations.
Ribbed tops appear mainly as sleeveless tanks or camis with thin (spaghetti) straps. Listings describe both sleeveless pullover styles and spaghetti-strap camis, including kid-specific versions.
Some ribbed sleep camis include light built-in support, such as a shelf bra or removable/ sewn-in pads, for gentle shaping and convenience.
Common fabrics are 100% cotton or cotton-rich blends. Some listings use cotton/polyester blends, and at least one specifies a cotton/recycled polyester/spandex blend (58%/38%/4%).
Listings reference general ribbed knits and specific patterns such as 1x1 rib (often for kids' camis) and 2x2 rib (used in some sleep camis), indicating varied rib textures across styles.