Bought for sports, I am satisfied for the moment ... until my arms to grow. In fact, I'm already at the limit of its size. I am however not a golgoth ... Search conditions, the One X perfectly fit into it. For now, I do not have discomfort of rubbing, or inadvertent detachment. The pocket for the key serves for me to nothing. If you put the key in the bottom, it is difficult recovered, if you put the key at the edge, it falls short, I will continue to put my laces.