New with tags, never worn. Vineyard Vines On The Go Brrr Button Down Shirt. Size XL (18). 57% cotton 38% brrr nylon 5% spandex Our On-The-Go Shirts for boys are lightweight, breathable and, above all else, really comfortable. And now, they're cooler than ever, thanks to the brrrº fabric. Made with cooling minerals, active wicking and rapid drying, this shirt will help regulate his body's temperature whether he's bundled up or wearing it on a hot day.