A white t-shirt with a deeply ribbed neckline maintains its shape around the neck after hundreds of wears instead of stretching into a sad oval that no longer sits right. Deep ribbing holds the neckline in place and keeps it looking intentional. This detail matters most on white t-shirts because the neckline is always visible and any sagging reads immediately. A properly ribbed neckline is one of those construction details that separates a cheap t-shirt from one worth buying twice. These are the white t-shirts that stay structured and properly proportioned through years of regular wear because the neckline construction actually holds.