• Lower-Back & Sacral Support That Starts Lower
• Upgraded Floating Sacral Cushion Design
• Breathable Pressure-Relief Mesh
  Waterfall Seat for Better Leg Support
• 3 Recline Positions up to 135°
• Wide 3D Adjustable Headrest
• 4D Flip-Up Armrests
• Class 4 Gas Lift & Everyday Reliability
• 3-year free warranty

Responsive Lower-Back & Sacral Support:

Unlike chairs that only focus on the lower back, the Sihoo B100 Pro is designed to support both the lumbar area and the base of the spine where posture begins. By helping stabilize the pelvis and encourage healthier spinal alignment, it supports a more upright sitting position and helps reduce fatigue through long hours of work, study, or home use.

Enhanced Floating Sacral Cushion Design:

The B100 Pro features an upgraded floating sacral support system designed to feel more responsive, balanced, and secure as you move. Built to stay closely aligned with your lower back and sacral area, it helps provide steadier support where many basic chairs fall short—making everyday sitting feel more supported, more stable, and easier on your body over time.

Breathable Pressure-Relief Mesh Seating:

Designed for airflow, flexibility, and dependable everyday support, the B100 Pro’s breathable mesh back and seat help reduce heat buildup during long seated sessions. Its balanced tension and supportive structure help distribute pressure more evenly across your body, so you stay cooler, better supported, and more focused throughout the day.

Ergonomic Waterfall Seat for Better Leg Support:

The B100 Pro’s waterfall-style seat is shaped to better support the hips and thighs while reducing pressure behind the knees. With a more balanced seating surface that helps spread weight more evenly, it supports healthier sitting posture and helps make long hours at your desk feel less restrictive and less tiring.

3-Position Recline up to 135°:

Whether you’re staying focused, taking a quick pause, or leaning back to reset between tasks, the B100 Pro adapts with three recline positions up to 135°. It’s an easy way to shift posture throughout the day, reduce stiffness, and avoid staying locked in one position for too long.

Wide 3D Adjustable Headrest:

The wide 3D headrest gives your head and neck a more supportive place to rest, with flexible adjustment to help you find a better fit throughout the day. Whether you’re sitting upright, reclining, or shifting positions, it helps keep your upper body better aligned and more supported during both work sessions and short breaks.

4D Flip-Up Armrests:

The enlarged 4D armrests are designed to better support your elbows and forearms through different tasks—whether you’re typing, studying, creating, or relaxing. When you need more room, simply flip them up to slide the chair neatly under your desk, making B100 Pro a practical choice for smaller workspaces, shared rooms, and flexible home setups.

Class 4 Gas Lift & Everyday Reliability:

Built for dependable daily use, the B100 Pro features a Class 4 gas lift, durable frame construction, and tested materials designed to support up to 330 lbs. Certified by BIFMA, SGS, and TÜV, it’s made to deliver reliable ergonomic support and long-lasting performance you can count on every day.

Responsive Lower-Back Support

4D Flip-Up Armrests

Wide 3D Headrest

Support That Starts Lower — So You Sit Better

B100 Pro is designed to support both your lower back and the area below it, helping your pelvis stay more stable and your posture feel more naturally aligned throughout the day.

Arm Support That Adapts — Then Tucks Away

4D Arm Support That Moves With You

The enlarged armrests adjust in multiple directions for better elbow and forearm support while you work, create, or relax. And when you need extra room, they flip up neatly out of the way.

Flip Up. Slide In. Save Space.

When you’re done, the armrests flip up so the chair fits more easily under your desk—ideal for smaller workspaces, shared rooms, or flexible home setups.

Ultra-Wide, 3D-Adjustable, Extra Comfortable

A Wider Headrest That’s Easier to Get Right

The 3D-adjustable headrest gives you more room to find the right fit for your neck and head—whether you’re sitting upright, leaning back, or shifting positions throughout the day.

Support from Neck to Thighs

From the headrest to the seat, B100 Pro is designed to support the parts of your body that take the most strain during long hours of sitting—helping you stay more balanced and less tense over time.

Lean Back and Reset

Recline up to 135° when it’s time to take a break, stretch out, or shift positions. It’s a simple way to reduce stiffness and avoid staying locked in one posture all day.

3 Recline Angles All Sitting Positions

From focused work to relaxed breaks 3 recline positions let you find the perfect angle for every moment.

Breathable Mesh That Holds Up

The performance mesh is breathable, supportive, and built for everyday use—helping you stay cooler through long sessions while maintaining steady support over time.

Customer Reviews on Sihoo B100 Pro Ergonomic Office Chair With Flip-Up Armrest

Q&A on Sihoo B100 Pro Ergonomic Office Chair With Flip-Up Armrest

Customer questions & answers