What a terrible product, I bought 2 pairs, one for me and one for my dad, in both cases the only difference was the size. My dad used his every day, they lasted less than 4 months (both!). I used mine 3 or 4 days a week and they only lasted 5.5 months, 4 straps in that time, are you kidding me? Ah, and of course it's not 100% leather either! once they start tearing you realize what an expensive piece of crap, seriously, stay away!.