5 to avoid hangover which I despise. Really appreciate it. My son leaked through these for the first time last night. This tends to be contrary to popular advise and I do go up a half size with boots etc, but even with a sock the 6 was uncomfortably long. First, Ive received the product free as the result of a previous review of a set of earbuds I truly love and use daily. They need better packing on top and bottom. They have sent me replacements promptly and have been really enthused with helping. If youre looking for a lightweight black and off-white sandal these might be fine for you. The equalizer phone app is icing on the cake. No batteries included and eight are required.