If the rubber is a tight fittingly it is not shifted, if it says badly my arm hurts. But my conclusion to say that this degree is reasonable is the tightness of rubber. Although I have only used it for about a week, EVA is probably harder than vinyl chloride, so I use thin ones, but once I use it for a week it is not hard, so I guess it will be a thing I can use all the time It is. If it is vinyl chloride, it will be harder if it is used for 3 days, it will become harder than EVA as a stiffness, so it will be evaluated that EVA is superior if it exceeds 3 days. A good game until the third day. My evaluation is higher than made of vinyl chloride which will be harder in 3 days because it can be used for more than 3 days.