
National Sauna Week: wellness with great prizes
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From Monday 14 to Friday 18 September 2026, the Belgian Sauna Association is organising National Sauna Week. And of course, Thermae Boetfort and Thermae Grimbergen are taking part too!
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Anyone who looks after their skin has probably heard of collagen, but what exactly is it?
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Collagen is a structural protein that is naturally produced in your body. It gives your skin its firmness, but it is also found in your hair, nails, bones, muscles and joints. With ageing, your natural collagen production decreases, resulting in wrinkles, cellulite and less elastic, thinner skin.
Our skin experts use beauty products by Sirène, a skincare line exclusively made for us in a Belgian lab. These products are packed with active ingredients that provide clearly visible results.
Of the skincare products we use, the following contain collagen:
- All our hydrating gel masks. Among them, a cucumber one which you can buy at our wellness centres. In our treatments, we like to switch things up now and again, alternating between different gel masks. For instance, we may use a mask with strawberry or kiwi extracts one time and then a mask with lotus or argan oil extracts another time. We mostly use a hydrating gel mask in our 25-minute facial treatments, to finish off the treatment.
- Body milk: available to buy at our wellness centre reception.
- All our day creams: multi-care hypersensitive, hydrating, Kigelia Africana skin lift, our day cream with UVA protection, and our restorative snail cream. All these creams are also available to buy at our wellness centres for use at home.
- Night creams: At night, your skin is at rest, meaning it is in optimal condition to repair itself and absorb the active ingredients of our Perfect Harmony night cream.
- Our boost and our snail serums: both serums are available to buy at our centres and we use them in our facial treatments.
- Our collagen sheet mask. This also contains special stem cells from a Swiss apple that retains its firmness for an incredibly long time. This collagen sheet mask is used in our collagen facial treatment, but you can also buy it for use at home.
In addition, we offer several facial treatments in our Beauty Clinic that boost your body’s natural collagen production. Read all about these anti-ageing treatments here.
Want to know what treatment is best suited for your skin needs? Book a free info session and one of our skin experts will be happy to tell you what you can expect!

- Promo - Promo
From Monday 14 to Friday 18 September 2026, the Belgian Sauna Association is organising National Sauna Week. And of course, Thermae Boetfort and Thermae Grimbergen are taking part too!

- Promo - Promo
Visit Thermae Boetfort or Thermae Grimbergen in August and receive an exclusive voucher! This voucher lets you bring someone along to our sauna and wellness centre for free between 1 September and 16 October 2026.

- Aufguss - Aufguss
Heat and scent come together in one intense wellness moment. But what exactly is an Aufguss session? Find out how our sauna masters prepare this sauna ritual and how these sessions affect you!
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