I ordered true to size pair first however they were a bit tight (REALLY tight, honestly) in the toe box. I hoped sizing up would alleviate this issue and happy to say, it totally did! I got this pair since I live in the NW of USA and it tends to rain here quite a bit. I like to try keep my feet dry and so far none of the "waterproof" claims seemed to stack up and I kept coming home with $200 wet foot boxes.
First thing I tried with these was to put a shoe under running water (faucet). Kind of mesmerizing watching water glide off a shoe. Any drops (including tiny droplets) that seemed to stay behind "run" off after I tapped the shoe lightly. Of course, haven't had real rain since I got the shoes but I'm thinking these will work nicely. They are comfortable enough and seem to keep my feet warm, not sure about summer though, I'll have to wait for that and see if I get too sweaty. In any case, so far so good.
P.S. The free socks code won't add socks for you, you have to manually add the socks. Discount simply got applied to the pair of shoes I bought, and they came with no socks (boo).