Belgian sauna culture

Belgian sauna culture is the set of customs, dress codes and bathing rituals found in public saunas and thermal spas in Belgium, where large wellness complexes combine permanently zoned nude and textile areas with scheduled swimwear days, quiet etiquette and a strong Aufguss programme. It forms part of Sauna culture and Bathing culture in the Low Countries, closely related to Dutch sauna culture and German sauna culture, but with a more explicit spatial separation between clothed and unclothed bathing than is usual in the Netherlands. Understanding that zoning is the key to an unembarrassed first visit.

Belgian houses market themselves as day spas rather than simple hot rooms. Visitors typically book a full or half day, circulate between Finnish saunas, herbal saunas, steam baths, pools and gardens, join infusions led by a sauna master, and rest in bathrobes in restaurants and quiet rooms. The underlying rhythm — heat, cool, rest, rehydrate — follows the classic northern European ritual described in Sauna etiquette and Sauna around the world surveys, while the dress rule depends on the zone and the calendar.

Historical background

Belgium has no indigenous sauna tradition of Finnish antiquity. Finnish sauna history, inscribed by UNESCO in December 2020 with about 3.3 million saunas for 5.5 million inhabitants and the steam-spirit löyly at its centre, provides the historical reference point for all modern sauna practice. Belgian commercial sauna culture, like Dutch practice, developed mainly in the late twentieth century from Finnish, German and thermal-bathing influences, supplemented by the Ardennes thermal tradition around Spa and Chaudfontaine.

Growth followed urbanisation, rising disposable income and cross-border example. Dutch Thermen groups expanded towards the Belgian border with houses at Maastricht and Berendonck near Nijmegen, while Belgian groups such as Thermae Boetfort near Brussels and Thermae Grimbergen developed large complexes serving Flemish, Walloon and international guests. The Belgian Sauna Association (Belgische Saunavereniging) now coordinates promotion, including a National Sauna Week scheduled for 14–18 September 2026 with participation from major houses. The event illustrates how far sauna-going has moved from a niche naturist activity towards mainstream wellness.

Unlike Finland, where almost 90 per cent of people sauna at least weekly in domestic or club saunas, Belgian use remains predominantly commercial and occasional: a planned day out, a couples’ retreat, a treatment day or an evening session rather than a weekly domestic routine. This shapes everything from pricing and programming to etiquette explanation, which is generally thorough and multilingual in Dutch, French and English.

Zoned bathing: Moenia and Curia

The clearest Belgian particularity is permanent zoning. Thermae Boetfort, one of the best-documented complexes, divides its thermal baths into Moenia, the nude area, and Curia, the bathing-suit area, each with its own saunas, baths and rest spaces and distinct dress rules. The model allows mixed groups with different comfort levels to visit together, allows first-time bathers to remain in swimwear throughout in Curia, and preserves a fully textile-free environment in Moenia for those who prefer it. Day tickets may cover one zone or both, and movement between zones requires changing and showering.

Garment rules are precise for hygiene reasons. Men are required to wear short, fitted swim shorts; loose beach shorts are prohibited because they absorb water, dry slowly and carry dirt into baths and saunas with consequences for water quality and infection risk. Women may wear a swimsuit or bikini, with classic cut, open neckline and no sleeves or legs. Slippers are compulsory throughout the thermal baths to prevent slipping and protect hygiene, while bathrobes are required in restaurants and on terraces so guests do not sit in wet swimwear. Bathrobes and slippers are left outside the cabin itself, where the body is expected to sweat freely.

This contrasts with the Dutch default, where on regular days the whole sauna landscape is nude and swimwear appears only on calendar swimwear days. Belgium institutionalises both options every day through space rather than only through time. Visitors from Britain, America or Canada, where textile use is normally assumed, often find the Belgian split easier to navigate than a fully nude-by-default house, while visitors from Germany recognise the Moenia rules immediately.

Swimwear days and the calendar

Zoning does not remove the calendar. Belgian and Dutch border houses also operate scheduled swimwear days on which swimwear is mandatory throughout, including in saunas that are otherwise nude. Thermen Berendonck near the Belgian border designates every Wednesday and the last Sunday of the month as swimwear days; Thermen Bussloo uses every second and last Tuesday, with more frequent dates in July and August; Thermen Maastricht uses Thursdays in even weeks, Tuesdays in odd weeks and Sundays. Thermen Maarssen, by contrast, offers no swimwear days and directs textile-preferring guests to sister houses — a reminder to check before booking.

On such days only swimwear specifically designed for swimming and sauna use, in Lycra, polyester or polyamide, is accepted. Operators explicitly advise against body-covering swimwear such as burkinis or long suits in the sauna itself, because fabric that prevents heat release can lead to overheating and related health problems; guests who need covering for religious or medical reasons are advised to consult staff about suitable sessions and lower-temperature cabins. Bringing lists are standardised: a large cabin towel, two drying towels, bathrobe, slippers and a water bottle, all available for hire if forgotten. Advance booking is mandatory at most large houses to regulate numbers.

Thermae 2000 across the Dutch border summarises the logic in the same terms: sauna originally nude, with swimwear days as accessible exceptions requiring extra attention to showering and towel hygiene. Belgian practice follows the same hygiene reasoning while applying it through both zones and dates.

Etiquette and the bathing ritual

Belgian etiquette combines German thoroughness with a conciliatory tone towards newcomers. The prescribed round is familiar: hot shower even if already showered that day, thorough drying with a separate towel, optional warm foot bath to preheat, eight to twelve minutes in the cabin with the whole body on the bath towel, gradual cooling beginning with fresh air then cold shower or plunge, at least fifteen minutes of rest, and rehydration. Cabin temperatures typically range from about 50 °C at low level to around 100 °C at the top, with upper benches markedly hotter.

House rules add gaze, noise and device discipline. Staring, loud conversation, seat-reserving, entering or leaving during an Aufguss, wearing street footwear beyond the changing rooms, and any photography or phone use in bathing areas are treated as breaches. Belgian houses enforce camera bans strictly, in a context where covert filming cases in Low Countries saunas have led to prosecutions and sustained press attention. Lockers, wristband payment systems and multilingual signage reduce the need for confrontation, but masters and attendants will intervene.

Silence grading is common: quiet saunas, panorama saunas for soft conversation, and event saunas for guided rituals. During infusions, doors remain closed, late entry is refused and early exit is permitted only for discomfort, quietly and without repeated opening. Outside ceremonies, discreet conversation is generally accepted, particularly in Curia and garden areas. These gradations belong to Sauna etiquette by country rather than to any Belgian statute; no single Belgian sauna law prescribes behaviour, and houses operate under general public-health, pool-water and workplace-safety rules.

Aufguss and programming

Scheduled infusions structure the Belgian day as they do the Dutch and German day. A sauna master pours essential-oil water onto stones and drives humid heat towards bathers with towel techniques across two or three rounds, often with cooling breaks and applications of salt, honey or clay. Show infusions add music, story and costume; meditative infusions emphasise breathing and stillness; herbal rituals use branches, peels and infusions in milder cabins.

German influence is direct. In Germany, where regular sauna use is mass practice — about 30 million users across roughly 2,300 public saunas on commonly cited association figures — nude, mixed-gender, towel-based bathing with master-led Aufguss is the norm. Belgian masters train in the same techniques, compete internationally and often work across the Dutch–German–Belgian triangle. Belgian programming tends to be pitched slightly softer for mixed textile/nude audiences, with clear intensity grading and English/French/Dutch narration.

Treatment menus — massages, facials, scrubs, hammam foam, private suites — are extensive and economically central. National Sauna Week and seasonal night-sauna, sound-bath and winter-swim events extend demand beyond weekends. Participation in any ritual remains voluntary; bathers who prefer self-directed silent use can avoid event cabins entirely.

Facilities and regions

A large Belgian complex typically offers Finnish saunas at several temperatures, infrared cabins, herbal and salt saunas, steam rooms, hammam, outdoor wood-fired cabins, plunge and thermal pools, foot baths, gardens, fireplaces, quiet rooms with waterbeds, restaurants and beauty floors. Flemish houses around Brussels, Antwerp and Ghent serve dense commuter catchments with evening trade; Walloon houses towards the Ardennes lean on thermal water, forest settings and French-speaking clientele; border houses serve Dutch and German day-trippers with trilingual communication.

Food and rest follow the Dutch pattern: bathrobe compulsory in restaurants, towel discipline at the table, moderate alcohol service with an expectation that intoxicated guests do not use hot cabins, and a rhythm of several rounds across the day rather than a single sweat. Family access is channelled through textile zones or dedicated family hours; nude zones generally restrict children’s admission by age and time.

Within Sauna around the world, Belgium thus represents a pragmatic compromise: more structurally textile-friendly than Germany or the Dutch nude default, more communally nude than Britain or North America, and more systematically zoned than Austria. For the first-time visitor the practical consequence is simple: choose Moenia for traditional nude bathing, Curia for swimwear throughout, and check the swimwear-day calendar before assuming either rule applies everywhere.

See also

• Dutch sauna culture
• Sauna in Germany
• German sauna culture
• Sauna etiquette
• Sauna rituals
• Sauna in the Netherlands