
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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Of course, a day of sauna and wellness at Thermae Boetfort is all about relaxation, rest and enjoyment. To make sure of that, it’s important to know in advance which dress code applies in our thermal baths. Here you’ll find everything you need to know about our rules on swimwear, slippers and more!
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These rules exist not only for your comfort, but also to guarantee the hygiene and safety of all our guests.
Men are required to wear short, fitted swim shorts. Loose swim shorts are not allowed.
Why? They absorb more water, dry more slowly and carry outside dirt and substances into our baths and saunas. This has a negative effect on water quality and the risk of infections.
Women may wear either a swimsuit or a bikini. Note: swimsuits must have an open neckline, with no sleeves or legs – a classic model that combines both comfort and hygiene.
Didn’t bring a suitable bathing suit, bathrobe or slippers? You can rent them at reception. So you can enjoy your wellness moment carefree.
Slippers are compulsory in the thermal baths. They prevent slipping and ensure proper hygiene. We recommend non-slip slippers, so you can safely move from sauna to pool and from the steam bath to the relaxation area.
In some areas, such as our restaurant, wearing a bathrobe is required. This feels comfortable and ensures hygiene and discretion while you enjoy a snack or drink at the table without having to sit down in your wet swimwear.
Going into the sauna? Leave your bathrobe and slippers outside. This allows your body to relax and purify as it should during a sauna session. The sauna is not the place to dry your bathrobe or other items.
To ensure peace and quality in our thermal baths, diving and swimming goggles, toys and headwear are also forbidden.
Will you help keep the wellness experience in our thermal baths pleasant, safe and hygienic for everyone?

- Promo - Promo
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