- Men's light blue shirt - Monaco collar, long buttoned sleeves - SLIM shape, 100% linen - Button closure, IKKS button left cuff - IKKS #actforbetter: material contains 100% linen certified Masters of Linen® and European Flax® The pastel trend continues with this sky-blue Men's shirt. Made from 100% Masters of Linen® and European Flax® certified linen.