Description of Keen Bellingham Crew Lite Socks A comfortable, anatomically correct fit? Sounds about right (and left). Features: Material: Natural Merino wool & nylon/lycra A comfortable casual style anatomically designed to fit his right and left foot Cushioning across entire foot bottom for impact reduction and moisture management Anatomical flex fit system reduces bunching of material under foot Y heel pockets for better fit Anatomical Flex Fit system reduces bunching of material underneath feet Lycra top to bottom for fit and comfort Ravel free double welt top to keep socks up