There had been times that the sizing is quite different across all designs, but it seems to have gotten better/more consistent. For 'historical' reference, I purchased 4 designs of the level 4 socks 3 years ago. Two of the designs run larger than the other two, enough that they don't fit the same for me and I have to give the larger ones away to friends with one shoe size larger. Not bad for sharing, but that was not intentional. The latest batch that I bought for my husband seem to be quite consistent in terms of sizing (or, he just hasn't 'complained' yet). Sizing aside, they are very comfortable and warm socks during the cold seasons in Canada, and it's good to know you aren't stuck without between wash if you purchased a a bundle, and it's more economical this way than buying a pair at a time.
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