But a few years ago Under Armour invented their new Sonic fabric, which according to Under Armour provides extreme comfort and compression without restriction. And although I had never felt an impaired comfort or compression with the old well-known Under Armour shirts I liked the new design. For apparently the Sonic series allow the designers to print the motif right on the shirt without the need for annoying seams, like was the subject sublimated on the surface of the shirt.