FlexiSpot BS11PRO is an adjustable ergonomic chair,mesh backrest and seat which makes for a very comfortable sitting experience and the chair was breathable,arch-shape design of the headrest which offered excellent relief from tech neck and seemed to really help in reducing the pressure from our daily sit,The advanced backrest design is the result of the most advanced technology and research. It is fully ergonomically shaped, upholstered in breathable mesh and includes an adaptable lumbar support.Complete armrests with three-dimensional adjustment (height, depth and angle), giving the product a very high level of specification. A large headrest with height and angle adjustment is also included, thus enhancing anatomical adaptability. Silent and smooth PU wheel,Protect your floor.