Glerups Slippers - A hobby that grew In 1993 Nanny Glerups made, for the first time, a pair of slippers, from natural wool, from her own Gotland sheep. Friends and family received them so well, that Nanny started a small hobby-production. This was the beginning of the company Glerups.dk. Glerups slippers are handmade from 100% pure, natural wool. The wool is treated naturally, and the product is followed closely, all the way from the animal to your foot. The wool is washed in salt water and trimmed afterwards. The wool is made into socks and finally felted with steam. After this they are fitted with soles of pure soft calves skin.