It is made to be thin unexpectedly. However, there is a sense of security only for SAS-TEC. The knee is made softer than the chest because the operating area is large. Since the mouth of the part to put in the protector is still open, when entering your feet it entered the protector side several times. It will be okay if you get used to it. It seems that it was better if we could close it with Velcro tape etc. Good shopping was made.