Sensible option: K. Bell, $5
Splurge option: Alexander McQueen, $80 
Why dad needs it: Just because his kicks are stylish doesn't mean that his dogs won't be barking at the end of the day. His sock drawer is already full of calf-length athletic socks with holes in the ankles, so make sure he can stock it with some comfy options that aren't just boring old black and navy. With either color or a dope pattern, your dad can floss down to his toes.