Darn Tough socks are excellent (own numerous pairs); last order was not. Ordered 'medium'; apparently received 'small' which shrunk down to 75% the size of an equivalent pair purchased elsewhere. Closer inspection of packaging yielded a 'M' sticker that contradicted the 'S' designation found elsewhere. Product #1406 (expecting 1405) which matches womens/girls socks. Sock itself is labeled 'M'. Could have been human/packaging error but other product characteristics suggest these *may* not be authentic. Stitching and logo designs are slightly different than my other pairs. Going with 5 stars for product in general; -1 star for order/packaging snafu.