It's a luxe take on an old American standby. Take a modest crew neck sweatshirt and slim it down in the body and the arms. Then, instead of making it from your run-of-the-mill jersey fleece, craft if from soft knit merino wool or even softer cashmere. Finish them off with that signature "V" stitched into the collar—athletic details for the aesthetically minded. It's an upgrade we're seeing from both mass brands and designer labels as guys embrace a style that's relaxed but still refined. From J.Crew's birds-eye patterned lambswool to Todd Snyder's cushy waffle-knitted style, here are some of the best out there.