These custom socks made by Canadian Trail Running Co are a thin high perfomance sock. Made in North America, they have a 7" cuff and are fitted on the leg. They feature a waterfall on the back of both socks.
 
Sizes
S/M: Women's size 6 - 9 & Men's size 6 - 8
M/L Women's size 9 -13 & Men's size 8 -12