Posture corrector normal size we have SML and the posture corrector back size is adjustable ,generally speaking,chinese people fit for S or M And if you are from US ,Europe etc your market people is mostly exceed 1.75 or 1.8m maybe XL is a good choice for you .
As for material of the X shape back brace,it is padded straps and breathable fabric and black color .
1 : Provide private label posture corrector-which means we can add your own logo on our adjustable posture corrector with small q'ty suc as 100pcs or 200 as a start and can also customized the color box or carrybag as a package .
2 : Door to door shipping service - if you want to customized posture corrector but no shipping company ,we can arrange back posture corrector door to door ship for you and include your local tax and duty pre-paid .
3 :Good after -sale service - if you order posture corrector support from us ,if found defective items after bulk order be received ,we will provide free replace service so customer will not make loss.