- Men's dark green shirt - Monaco collar, long buttoned sleeves - EASY-REGULAR shape, plain knit - Button closure, IKKS button on left wrist - URBAN LAB line, ULTRA MOBILITY specificity: multifunctional stretch fabric, to stay chic without movement limits What makes this soft knit shirt so special? A multi-functional stretch fabric, so you can stay chic with unlimited movement. Ultra Mobility, remember its name.