· ⏩ DONATI OFFICE CHAIR--Equipped with the Donati self-weight mechanism, this office chair big and tall intelligently adjusts to your body weight and movements, delivering personalized support without the need for manual adjustments. Its innovative design ensures balanced pressure distribution, exceptional comfort, enhanced durability, and a quiet, seamless sitting experience tailored just for you· ⏩ ERGONOMIC HOME OFFICE DESK CHAIR--The office chair ergonomic features adjustable headrests, smoothest 4D armrests, adjustable lumbar support and height, a 3-position tilt lock(107°-117°-127°), and a sliding seat, all designed to enhance your seating experience. COLAMY Top-end Series office ergonomic chairs will upgrade your comfort to a new level· ⏩ VENTILATED ERGONOMIC MESH OFFICE CHAIR--Adopting high-end breathable mesh fabric imported from Korea with great flexibility and durability, the high back office chair perfectly fits the curve of your spine and protects the cervical and lumbar spine. In addition, the adjustable lumbar support also offers well support for your back· ⏩ PERFECT SITTING EXPERIENCE--COLAMY ergonomic office chair lumbar support comes with high elastic mesh and adjustable device to provide robust support for lumbar. Thickened and widened luxury seat cushions, high-density molding foam and 4D adjustable armrests will enhance the experience during long hours of work or intense gaming· ⏩ SLIDING SEAT ADJUSTMENT--The seat sliding feature can offer better back support to users as it ensures that your back is correctly pressed against the back of your ergonomic desk chair. They can also help to relieve pressure from the back of the knees, as you can spread your weight across the seat’s surface area