THE PEN. It is the most comfortable type of filling, but also the most expensive. They are usually goose, goose or a mixture of both and are perfect for backing. The disadvantage is that over time they deform and lose volume before.
THE FOAM. It is a very common option and also the most economical. Fillers are durable and have the advantage that they recover right away. Its drawback is that they are not very adaptable and hard. Choose a high density foam, so that the seat does not deform, but with a goose feather wrap so that the sofa is more comfortable and breathes better.
HYBRIDS. The sandwich filling makes the foam more comfortable by wrapping it with two layers - one above and one below - with goose feathers, or polyester. With none of them deforms.
SYNTHETICS Synthetic fillers are increasingly used, such as soft fiber, which achieves softer and softer results, and latex, with its anti-allergic and perspiration properties, apart from its undeformable quality.