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 260gsm 100% Polyester Summit Fleece is breathable & quick-dry Branded dyed-to-match nylon snaps Chest pockets with snap closure