This is how the $60,000 Hästens mattress is prepped up with horsehair.

The Hästens follows a tradition of mattress making which has been established since mid 19th century. Today, even with the advances of technology, a Hästens mattress is still explicitly made by hand.

According to their website:

People that have never seen our factory may doubt that the beds are actually made by hand. When two of our co-workers were doing a demonstration of their work at a store in Stockholm, people came up to them and said: “Come on, you can’t really work like that, can you…?” But we do. Our beds are made by hand, step by step, using natural materials. That is where the quality comes from. No machine can surpass the skills of a master craftsman when it comes to building a bed. We process the horsehair, we stitch, we cut and we tack. Finally, we make the last stitches and tuft the bed by hand to ensure the same quality.