I bought these socks as a liner for my wetsuit booties because my feet were getting cold while out paddling my outrigger canoe. They don't really help that much with warmth. The big toe needs to have the point cut off and be more rounded for a better fit.  Stretchier material would help them fit better overall since they are unisex sized and I have a narrow female size 10 foot. I bought the medium as recommended.