Marvel sondico base layer mens the marvel sondico base layer is a standout item thanks to its graphic print and striking colours made from an elasticated fabric for a snug fit it has a round neck and flat lock seams for comfort the optivent technology helps to draw moisture away from the skin for a cooler and drier feel while sondico branding finishes off the top mens base layer round neck short sleeves flat lock seams optivent technology printed marvel design