I'd check out PowerGrip soft toe straps that work w/o a toe clip (cage). Haven't tried 'em but they get good reviews. Formerly used toe-clips/straps & those can prevent using bulkier shoes which is esp bad in winter. But apparently PowerGrips easily allow bulky shoes, ie trainers, winter boots etc. I would have thought there were plenty of clipless bike/walking shoes that could also be used in the cold though. Clipless shoes can include a higher toe box, allowing, perhaps, for thick winter socks.