High-frequency is considered the state-of-the-art technology for car seat embossing welders because it diffuses energy uniformly over the whole fabric, avoiding any critical spikes: this leads to consistent, homogeneous and at the same time stronger welding, allowing for perfectly identical pieces. Furthermore, welding and embossing are entirely obtained at low temperatures, which not only makes embossing clearer and more precise, but also guarantees the absence of any superficial fabric damage, allowing for designs of any kind to be obtained. The technology used in top-range machines, such as the ones REG has already provided to some of the largest manufacturers in this field, also allows for a wide range of materials to be employed. Upon request we can produce hot quilting machines.