I no longer have to worry about running flat as these earbuds can go about 4-5 days, and about 2-3 if I use the case as a phone charger. My feet did hurt initially, but they?re fine now & I wonder how I coped before Vionic! Me parece un poco pesado, pero queda muy bien en la bici???? Nun gut, diese Sandalen habe ich seit acht Tagen, nicht seit acht Jahren ? da muss sich die Langzeitqualität noch bewähren. Close to perfect. Very interesting . Nothing is worse than stopping at a light, putting your feet down on the asphalt to steady your bike, and having your feet slip on the pavement. Im not sure how much more durable you can get than that. But again, absolutely great for the value for a storage unit! The hole is just a bit too small for the tip to fit on the ear bud.