Elasticity and flexibility are the most important factors for a fibre to be used in fill in applications like furniture, toys, pillows and mattress.
Having hole in the middle and spring type crimp gives a fantastic flexibility to hollow fibres and make them the best choice for above mentioned applications.
Hollow fibres can also be used for filters and fire resistant fabrics.
To achieve even more spring attributes from hollow fibres, they can be formed as small ball bulks which makes it several times more flexible.