# Office chair Topstar Sitness 10 Green — ergonomic task chair, adjustable height, lumbar support

**URL:** https://aio.lv/en/product--topstar-si59u-g05--1633726
**Data updated:** 2026-02-12 09:43 (EET)
**Category:** Ergonomic Chairs
**Manufacturer:** Topstar
**Manufacturer code:** SI59U G05
**EAN:** 4014296541297
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 239.49 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 197.93 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--topstar-si59u-g05--1633726

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.07.2026 | free |
| Courier delivery to door | 27.07.2026 | 13.74 EUR |

## Summary description

Topstar Sitness 10 Green is an ergonomic office chair designed for daily desk use. It features adjustable height and a posture-supporting Sitness mechanism that promotes active sitting and lumbar support. The chair is suited for home offices and workplaces, offering improved comfort, movement while seated and reduced strain during long work sessions.

## Long description

Topstar Sitness 10 Green is an ergonomic task chair engineered for daily desk use. It combines a compact footprint with a flexible Sitness mechanism that encourages micro-movements while seated and provides integrated lumbar support. The chair features height adjustment and a contoured seat to support neutral posture during extended work sessions in home offices and professional workplaces.
Advantages
The Sitness mechanism promotes active sitting by allowing slight rocking and pelvis rotation, which helps maintain spinal alignment and reduces static load on the lower back. Adjustable seat height enables correct desk positioning and leg clearance. The contoured seat surface and built-in lumbar support distribute pressure and improve sitting comfort without additional accessories.
Suitable for
Home office workstations and study desks
Office environments with moderate daily sitting time
Users seeking improved posture and dynamic sitting
Task-based work such as computer use, meetings, and paperwork
Key specifications
Ergonomic Sitness mechanism for active sitting and pelvic movement
Adjustable pneumatic seat height
Contoured seat with integrated lumbar support
Stable five-star base with smooth-rolling casters
Upholstery in green fabric; durable, breathable surface
How to use
Adjust the seat height so your feet rest flat on the floor and your knees form approximately a right angle. Sit back against the integrated lumbar support to maintain the natural curve of the lower spine. Use the Sitness mechanism by allowing small forward and backward movements; this supports circulation and reduces static muscle load. Roll the chair to reposition at your desk and lock your work height once adjusted for stable typing and writing.
Usage recommendations
For best ergonomic effect, combine correct seat height with regular short breaks and small posture adjustments throughout the day. Keep the casters clean and use on a suitable floor surface or chair mat to preserve mobility and base condition.

## FAQ

### How much does the Office chair Topstar Sitness 10 Green cost, and is it available for purchase?

The price is 239.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 8 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 22.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Topstar products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Topstar service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/1633726/47497097_large.webp