Charlie has a pair of ugg boots in a very cool green colour. I got them online, the brand is ouch. The come in all different sizes & colours & they have the nice rubber sole so they don't slip. Easy to get on & usually can tuck his pants into them.

I put them on all the time, around the house or quick trips down the street as they are very convinient. Otherwies I second the velcro slippers.