The Sihoo B100 is one of the best budget ergonomic office chairs I've seen, and Amazon has reduced the price by 25%, with the B100 dropping to $166 (was $220). And in the UK, the Sihoo B100 is now £150 was £190As good as the price reduction is, that's not the biggest reason I'd recommend this chair. That would be the adaptive lumbar support, a feature that's usually reserved for much more expensive office chairs and one that helps keep your lower back supported as you naturally move throughout the day.Unlike fixed lumbar cushions, the support adjusts with your posture whether you're leaning forward to concentrate, sitting upright during meetings, or reclining for a quick break. It's the kind of feature that can make a real difference if you're spending long hours at your desk.Today's top Sihoo office chair dealFor my money, the B100 is one of the best budget office chairs you can buy. The price is great, but the adaptive lumbar support is the standout feature. It offers consistent support even when you move in your seat, reducing pressure on your lower back and helping your posture.In the UK: now £150 was £190View DealAlthough my team and I haven't yet reviewed the B100 specifically, we've tested plenty of Sihoo office chairs over the years and they have consistently impressed us with their comfort, adjustability, and value.The widened seat cushion helps spread your weight more evenly, while the adjustable headrest provides extra support whether you're working, studying, or simply leaning back to think through your next project.Three reclining positions at 110°, 125°, and 135° let you switch between focused work and a more relaxed posture throughout the day.Flip-up armrests also make it easier to slide the chair neatly under your desk when you're finished.The breathable mesh back helps improve airflow, keeping you cooler during long work sessions or warm summer afternoons.A reinforced metal base, Class 4 gas lift, and support for up to 300lb complete a chair that is well equipped for everyday use and surprisingly affordable.Based on our experience with Sihoo's wider range and the features on offer here, this is one of the strongest budget office chair deals available right now.For more top picks, check out my guide to the best office chairs.Also consider: More Sihoo office chair dealsIf you have the budget, the Doro C300 is an exceptional office chair with more adjustability than the B100. We tested this one and found it very breathable and comfortable for all-day sitting in our review.In the UK: Now £240 was £340.View DealThe M18 from Sihoo is a solid budget office chair that's nicely designed and has all the core features. I'd still recommend the B100 over this one due to the better lumbar support.In the UK: Now £110 was £180.View DealThere's a lot I like about Sihoo's M57, including the adjustable lower back support, 3D armrests, and 330lb weight limit. However, it's more expensive than the B100 right now, and there's no adaptive lumbar cushioning here.In the UK: Now £229.23.View DealUS: Shop all Sihoo office chairs at AmazonUK: See all Sihoo office chairs at Amazon.co.uk