Hear us out. This is why you want a long sleeve tee right now. First of all, they're simply what every cool guy seems to be pulling on at the moment. Maybe because the lightweight cotton shirt makes for an ideal cover on those last few weeks of summer, when breezy nights are still too warm for sweats but a touch chilly for short sleeves. But more importantly, a long sleeve tee is one of those choose-your-own-adventure type of garments. You can wear them alone, untucked with jeans or shorts. You can tuck them in or push up the sleeves and wear them with trousers to add a shot of 2018 cool to your workaday office attire. It's the contradiction that makes them so cool. They feel a little counterintuitive or rebellious. And the best brands capitalize on this vibe by cutting their tees in fresh silhouettes or from richly hued pigment-dyed fabrics. We've pulled together 10 of the best options to buy right now.