腰痛

Adjustable lumbar support is the most important feature – it should move up/down and preferably in/out to fit your spine's curve. Other helpful features: sliding seat depth, adjustable recline tension, and a headrest to keep your neck neutral.

If the seat is too short, your thighs lack support, causing you to slouch. If too long, it presses behind your knees, forcing you to sit forward and lose back support. Proper seat depth (2-3 fingers between the back of your knee and the seat edge) keeps your pelvis upright and reduces lower back strain.

Yes. Slightly reclining (100-110 degrees) reduces pressure on spinal discs compared to sitting upright at 90 degrees. But avoid reclining too far for typing – use the lockable recline to switch between active work and relaxed postures.

Many users notice less back fatigue within the first week. For chronic pain that has developed over years, it may take several weeks of consistent use and proper adjustment to see significant improvement.

Yes. Models like EC200 and EC300 have sliding seat depth (up to 2 inches) and adjustable backrest height, fitting users up to 6'5". Always check individual product dimensions.

All ProtoArc ergonomic chairs support up to 280 lbs and come with a 5-year warranty on structural components.

Assembly takes about 20 minutes and is tool-free. Step-by-step visual instructions are included. Most users find it straightforward.