1.  According to the customer height、 waist、 one chooses the appropriate spinal to adjust the product gear.<br />2.  Two shoulder length Should be tied at back at the same time、 adjusting shoulders length  is to balance the straps of balancing weight<br />3.  Wear heavy belt、 adjust the length of the belt and belt bottom position、 the belt position should be around the navel<br />4.  Harness the top should be low head、 and breathable mesh is close to the back as far as possible so as not to make the entire people forward and bent<br />5 Color: White<br />6 Size: S / M / L