It's comfy.
I don't geddit. Why does it matter what I wear on my feet, for a start? I don't think I look any sillier in my socks 'n' sandals than I do in my giant ugg-a-like thingies. Or any more foolish than girls falling off stratospheric heels they can't walk in.
Is it because it's scruffy? Or because it's reminiscent of middle aged chaps on holidays?
EXPLAIN PLEASE.