Is a horsehair mattress allergenic?

No, quite the opposite. Horsehair used in mattresses undergoes a thorough cleaning process (washed at 140°C, without chemicals) and is afterwards 100% free of allergens. 

• Naturally anti-mite, antibacterial and mould-resistant
• House dust mites find no breeding ground in the dry, well-ventilated structure
• For people with allergies, horsehair is often a healthier choice than synthetic alternatives