Jack Wills Merino Crew Jumper. Aintree Merino Crew JumperCrafted from Merino wool, this soft jumper is designed with a classic crew neckline and a ribbed collar, hem and cuffs. Our heritage Mr Wills is embroidered at the chest.Classic fitCrew necklineMerino wool constructionRibbed collar, hem, cuffsMr Wills embroidery