NWT River Plaid Button Up - Sea Salt | Z Supply River Plaid Button Up - Sea Salt I Z Supply. Embrace casual comfort with our plaid button-front top, perfect for layering open over a tee or wearing buttoned up. Made from buttery soft rayon flannel shirting, this relaxed piece teels like a well-loved favorite from the first wear. 65% Rayon, 35% Polyester Color: Sea Salt Length: 27.25" Size Large Measurements Bust: 49.5" Length: 28.5" Washing Instructions Hand wash cold separately. Do not bleach. Hang to dry.