Southern Shirt Youth Feather Knit Sweater. Just in time for sweater weather season, this soft knit sweater is ready to keep your girl comfy. This mockneck sweater is made from a combination of lightweight nylon, breathable rayon, and highly-durable polyester in an ultra-soft eyelash knit. The trendy mockneck style adds coverage without excessive layering. Slightly cropped for a more modern vibe with playful balloon sleeves for a youthful energy.