With us, uncompromising quality meets masterful craftsmanship – made in Altenberge, Germany, since 1946. Each of our down toppers is more than just a mattress protector – it's perfected craftsmanship combined with the highest quality materials. A down topper is an excellent addition to your mattress, providing additional comfort, support, and improved sleep quality. Its breathable and durable properties help create a pleasant sleeping environment and extend the lifespan of your mattress. We're sure you've never slept so softly. Otto Keller Manufaktur products are tailored precisely to your personal needs. For your best night's sleep.