No. Ribbed knit describes a fabric with a visible raised-line texture, while sweatshirt fleece usually refers to a thicker sweatshirt fabric with a soft brushed or looped interior. This set is made from a cotton-rich ribbed knit blend and is not described as fleece-lined. It is designed to feel cozy without the bulk of a heavy fleece sweatsuit.

It depends on your child's comfort and the temperature. A lightweight T-shirt underneath can add an extra layer, make temperature changes easier to manage, and reduce direct contact with the knit texture for children who prefer a smoother layer against the skin. If the sweater already feels comfortable on its own, an undershirt is not required.

Not necessarily. Pilling depends on the fiber blend, yarn construction, friction, and care routine rather than the ribbed texture alone. Areas that rub frequently, such as under the arms, along the sides, or between the legs, may show wear sooner on many knit garments. Turning this set inside out before washing and using a gentle cold cycle can reduce unnecessary surface friction.

Excessive heat can be harder on both cotton-rich knit fabric and stretch fibers. Cotton can shrink with heat, while repeated high temperatures can also affect the recovery and shape of stretch fabrics over time. For this set, machine wash cold on a gentle cycle and lay flat to dry as recommended. Reshape the sweater and joggers while slightly damp rather than using high heat to force them dry.