What is a Shirtjac? Quite simply it's a shirt-jacket combo that makes an excellent work shirt and layering piece.The Norris Shirtjac is a lined shirt crafted with sweater fleece, a smooth rugged sweater knit exterior and soft brushed interior for exceptional warmth and comfort. This fabric is breathable, easy care and Quick-dry. Relaxed through the chest and sleeve, designed with extra room for layering.260gsm 100% PolyesterSummit Fleece is breathable & quick-dryBranded dyed-to-match nylon snapsChest pockets with snap closureTwo hand pocketsAdjustable snap cuffsMK icon embroidery on back yokeMen's Size Chart Relaxed Fit Relaxed through the chest and sleeve Adjustable cuff with button closure Chest pockets with snap closure