"Summer sweaters" may sound like an oxymoron straight from the devil's mouth, but these aren't winter knits repurposed for warmer months: These are surf-y, sporty, cool, and, best of all, entirely lightweight. They're dip-dyed, tie-dyed, macramé'd, or palm-tree-printed. Take rag & bone's open-weave top and layer it over a swimsuit, post-swim and pre-barbecue. Or Proenza's ombré pullover: required bonfire attire. Phillip Lim's neoprene sweatshirt is for the aspiring Montauk surfer, and Raif Adelberg's crew neck is for the Venice Beach boardwalk. And if you don't swim, surf, or hang out near water in general? Your office is probably over-air-conditioned anyway, so enjoy these options below.