The Dual Backrest Ergonomic Office Seat with Breathable Fabric Outside offers an active sitting experience with instant comfort, easy height and headrest adjustment, and enhanced mobility. The fabric is high-quality IDA net fabric, with optional colors in white and black. The auxiliary materials are polyurethane sponge and nylon plastic. The cushion has a free and easy locking function, allowing the headrest to rise and fall, and the backrest to swing around. It features a powerful hydraulic system with a 100# sinking 5 spraying SGS certified gas lift and 2.5 level BIFMA certified gas lift. The chassis is 2.5 thick and tested by 1150BIFMA silent universal wheel.