Shop Unisex's at RalphLauren.com, the Official Site of Ralph Lauren. Crest Cotton Half-Zip Sweater - Knit from soft cotton, this striped half-zip sweater features an embroidered heritage-inspired crest. Mockneck. Half-zip front. Long sleeves with ribbed cuffs. Ribbed hem. Embroidered "Polo Ralph Lauren & Co." crest accents the left chest. 100% cotton. Machine washable. Imported.