I like the unpadded sole Smartwool socks, but they are naturally more of a sheep color of white, kind of ivory. Otherwise, all of the thin cotton/poly blend white athletic socks I have purchased at Wal-Mart have stayed nice and white. I don't use bleach. I rarely use "Biz". And of course, I don't wash any colored clothes with my whites. Some fabrics turn color if you use the wrong type of bleach for the fabric. (I turned a white poly cotton jeans jacket kind of yellowy once doing that). Very annoying to ruin new clothes! good luck. Tokie