1. The Pro version allows you to adjust and lock the angle of the backrest, while the Standard version only allows you to adjust the angle of the backrest, but not lock it.
2. The Pro version has an adjustable seat depth while the Standard version has no seat depth adjustment.
3. The Pro version uses blade wheels, which glide very quietly and won't scratch your expensive wood floors, while the Standard version uses regular PU wheels.
Both versions of the Freedom-X chair use a Korean KGS class 4 hydraulic gas lift. The high-quality hydraulic gas lift ensures your safety and provide you withthe best user experience.