The Ultimate Wader Sock. The FITS over-the-calf Wader comforts your entire lower leg with super-soft Merino wool and keeps you just warm enough in those ice-cold waters. Best of all - pull them up once and they'll stay up all day. Dynamic Toe Cup contours to the shape of your foot while the Heel Lock provides heel security that limits the chances of a blister when combined with a properly fit boot. From brook to blind, this sock does it all.