1. From the actual safety performance and said: We adopted international standard steel head (compliance standards: 23KG hammer 900MM high in free fall, toe internal clearance greater than or equal 15MM anti-static pressure 15KN.), Can be more effective protection your feet, improve the safety and comfort of the space. The purchase price of a standard steel head: 8 yuan, a non-standard steel head purchase price: three dollars; Sole Material: We use natural rubber (non-quadratic reclaimed rubber), increase durability and reduce shoes pungent odor ; cortex: We use high-grade quality leather floor and not others choose rayon (not the skin); 2. From the research point of view: All the shoes surface can not see the difference, but according to human comfort study, we follow ergonomic Asia , according to the proportion of bone and human growth study, so that the forefoot and heel shoes do basically consistent with the ratio of the distance, so wearing the most comfortable, if the ratio is not perfect wearing comfort will be greatly reduced; 3. for sale: We have since the sale of goods Within a month, human damage (off the bottom / section) are maintenance free exchange, our attitude depends on our confidence in the sale of product quality;