They came a day earlier than expected which was a lovely surprise and the slippers. Il pacco è arrivato in tempi rapidissimi. Wenn ich mich daran gehalten hätte, hätte ich einne Rücksendung vermieden! In terms of break-in period, I had none. They fit good I like them 89. I put them straight on and did i 15mile patrol with no issues . The rubber outsole seems durable for kicking around the house, but dont go hiking around town in these shoes if you want them to last long term. I ordered this so we could use it to charge our phones and tablet in our camper off the cigarette lighter style plug. One day I hope to be reunited with it.