Selling EUC Stio Men's Men's Eddy Shirt LS, Speedy Stream Blue Check, size L. The best-selling Eddy goes everywhere you do, no matter the season. A classic gets a few modern, technical upgrades, like UPF 50+ and a water-resistant finish. Praised by SKI Magazine as "The greatest shirt ever made," the Eddy is a soft-handed, lightweight tech shirt that is ready for anything. Made with Conflux™, a nylon/poly blend with a water-resistant finish, mechanical stretch and a UPF 50+ sun protection rating, it also features pearl snaps and a modified shirttail hem that tucks in or out.