Since it is a system to bind with a string, if you adjust the tie-down adjustment by yourself, you will not be troubled by slippage during work. As you can see, the string on the arm side, as you can see, if you tie behind the neck, you will not fall out and fall out. If you work asleep you need to devise. It is good to sew or tie it so that the tip of the string does not get frayed. Because it is a canvas of production, if you are interested in smell, please wash several times and dry before using it. Multiple bleaching is necessary to make off white color.