One of the main advantages of the mechanism is that the seat and backrest are not connected. When the backrest moves, the seat moves in the same direction in a certain ratio (usually 2:1 or 3:1). This gives a more pleasant sitting sensation and reduces the load on the back muscles. The chair's synchronous control mechanism allows to lock the tilt angle to the desired sitting position.
As the chair swings freely, the synchronous mechanism actively maintains an optimal and ergonomic seating angle. The firmness of the chair's oscillation can be adjusted individually according to the weight of the sitter. Ergonomic office chair SITNESS 45 with pneumatic lift easily raises or lowers to the desired sitting
height. The Ergonomic chair SITNESS 45 with synchronous mechanism is recommended
SITNESS is an ergonomic dynamic mechanism. It has been medically proven that the chair’s three-dimensional dynamic mechanism resembles sitting on a ball – the seat moves forward, backwards and sideways with the body, adapting to the body’s movements. This makes for a very comfortable seating experience, as the back muscles are not strained – sitting in this chair relaxes the intervertebral discs in the spine, which improves blood circulation.
Although the benefits of SITNESS have been proven by medical studies, some clients find the dynamic mechanism uncomfortable and unstable. If you are unsure whether SITNESS is really for you, we recommend that you contact one of our consultants or try out a chair with the SITNESS mechanism in person in our showroom.
SITNESS 45 is also recommended by our partner HEALTHY BACK SCHOOL.
Ergonomic desk chair SITNESS 45 with 2D armrests
The armrests of this chair provide support for the arms. This reduces tension on the arms, shoulders, neck and hand muscles. This is particularly important when sitting for long periods of time. When work is finished, the armrests can be used as a support when standing up, thus reducing the strain on the pelvic muscles.
The armrests can be raised or lowered to the desired position with the push of a button. If the armrests are locked too high or too low, they may interfere with your body movements and cause discomfort.
It is recommended to choose an armrest position that allows the arms to be bent at about 90° while sitting at the desk, with the shoulder blades naturally relaxed and in a straight horizontal line. It is important to ensure that when sitting in a chair, the legs of the person should be at a straight 90° angle to the floor.
SITNESS 45 is an excellent ergonomic solution. If you have any questions about how to adjust your ergonomic chair, please contact our consultants.
Adjustable headrest height
People who spend a lot of time working at a computer often eventually start to feel fatigue in their shoulder and neck muscles, leading to discomfort and muscle tension. SITNESS 45 headrest helps relieve some of the tension and pain by providing support for the neck and upper back.
The headrest can also improve your posture. When the head is unsupported, people automatically lean forward when working at a computer, creating pressure in the neck. Sitting in not optimal position for prolonged periods of time can lead to long-term spinal problems.
A headrest provides comfort, makes the user feel better and more productive while working, and increases the likelihood of maintaining the correct posture while sitting. The headrest is height-adjustable, so everyone can find the most comfortable seating position for their height. Before buying a chair with a headrest, we recommend to make sure that the Ergonomic computer chair SITNESS 45 will provide the user with comfortable support and that seating experience will feel comfortable. We recommend visiting our showroom and trying this chair model in person.
Office chair SITNESS 45 is recommended for creating an ergonomic working environment.
The ACTIVE SITTING office chair SITNESS 45 is also recommended by our partner Healthy Spine School. Who not only encourage safe and effective exercise, but also draw attention to quality ACTIVE SITTING in the workplace and home environment.
The seat of this chair is covered with a soft tapestry fabric. This type of fabric is particularly popular because it is soft and pleasant to the touch to the skin and is available in a wide range of colours. Tapestry chairs match easily with the surrounding furniture and décor. Tapestry is a relatively hard-wearing and durable material, so the chair can be used comfortably for many years.
It is worth noting that tapestry seats are sometimes can become a popular place for cats to scratch their claws. Before buying an office chair, assess your pet’s tastes. If you think this may be a problem, we suggest you contact our experts to find a solution that works for you.
Adjustable backrest height
SITNESS 45 has a height-adjustable backrest. Often the backrests are slightly curved to replicate the curve of the spine. The height of the backrest of the chair allows to adjust so that the lumbar region of the body is comfortably supported and there is no discomfort.
Height adjustment allows the backrest to be adapted to different people of different heights and body shapes. The adjustable backrest height is a great feature for chairs that will be used by more than one person or for tall/low people. For more information on how to adjust your chair correctly, read our blog or contact our consultants.
Ergonomically shaped seat and backrest
Our customers are particularly fond of Ergonomic chair SITNESS 45 for its aesthetically pleasing backrest. Not only can it is stunning to look at, but it also serves a functional purpose – the moulded backrest follows the natural trajectory of the spine and supports the back muscles. The additional support replicates the curves of the spine and evenly distributes the weight of the support over the entire back, thus improving blood circulation and promoting a healthier sitting posture. Long-term correct sitting SITNESS 45 can help prevent or reduce back pain and other chronic conditions associated with incorrect sitting.
10 mm castors (for soft floors)
Ergonomic computer chair SITNESS 45 is with castors for soft flooring. If the chair is used on hard flooring (wooden flooring, parquet, laminate), the surface may be damaged or scratched over time.
Our specialists recommend that you purchase additional castors for hard flooring. Wheel axle 10 mm. The castors are made of thermoplastic elastomer, sometimes called thermoplastic rubber, which is a physical mixture of polymers consisting of materials with both thermoplastic and elastomeric properties. These wheels are softer and do not scratch hard flooring.
We recommend purchasing a plastic mat under the chair to protect the more sensitive floor covering. If a stable, fixed seating position is desired, we recommend chair feet instead of castors. When choosing chair castors, it is very important to pay attention to the type of use and the floor covering, if you are not sure we recommend you contact our consultants or visit our showroom.
Made in Bavaria – TopStar
SITNESS 45 was produced by TopStar, one of the world’s largest office chair manufacturers. The company is known for its German quality, wide range of products and focus on office ergonomic solutions. The manufacturer is a leader in the implementation of eco-friendly solutions in product packaging, with more than 8 international eco-certifications. We are proud to be a TopStar Authorized Supplier.
Office chair SITNESS 45 is made of easily recyclable materials, the parts of the chair are free of impurities and can be easily separated during recycling. This ensures that after many years of use, the chair will be easily and sustainably recycled. This is a very important function of the chair in order to reduce the global footprint of the products we sell.
We see corporate environmental sustainability as our duty and responsibility. Our company is certified to the EN ISO 14001 Standard for Effective Environmental Management. This certification demonstrates that the company assesses and addresses environmental factors in its procurement, production and supply chains. The EN ISO 14001 standard is an international European standard, recognised in all EU countries, which demonstrates the company’s commitment to ecology to its customers.
Awards and certificates
German quality – GS certificate
OEKO-TEX quality certificate
SITNESS 45 complies with and has been awarded the STANDARD 100 by OEKO-TEX quality certificate. The purpose of the standard is to ensure that the textile material does not contain any harmful chemicals or other substances. This is particularly important as our bodies interact with the fabrics of the chair on a daily basis and children come into contact with the fabrics. OEKO-TEX certification tests various parts of the production process, from the dyeing of the material to the hemming. Random quality tests ensure that the fabrics of the product you buy are free of any harmful or harmful substances.
Blue-Angel ecology certificate
This product is also Blue-Angel certified. This certification has been created in 1978 to identify environmentally produced German products. The Blue-Angel label ensures that the company’s products have met various ecological environmental standards and indicates that Ergonomic desk chair SITNESS 45 is a more environmentally friendly choice than competitors’ products.
Castors for hard flooring
Additional castors are desinged for hard floors (wooden, laminate floors). Castor axle 10 mm. The castors are made of thermoplastic elastomer, sometimes called thermoplastic rubber, which is a physical mixture of polymers consisting of materials with both thermoplastic and elastomeric properties. These wheels are softer and do not scratch hard flooring.
If you prefer a stable sitting position on this work chair, you can also purchase optional feet instead of castors. When choosing chair castors, it is very important to pay attention to the type of use and the floor covering, if you are not sure we recommend you contact our consultants or visit our showroom. Learn more.
Our specialists recommends taking breaks during work based on medical research. Taking a 15-minute break every 45 minutes to move around. Prolonged sitting in one fixed position increases the likelihood of chronic pain and cardiovascular disease. We recommend combining seated work with standing work, together at a height-adjustable table! Learn more
When you buy an office chair, we often get questions about whether the castors can be replaced with feet. Of course! An office chair with feet is stable and its functionality remains unchanged. This is especially true for workplaces where there is a small, limited working area and stability is needed: shops, warehouses and production companies. People with disabilities or elderly customers often ask for chairs with feet. Learn more.