Wow this is awesome module for prestashop, but honestly is too expensive to buy for an ecommerce shop. So, many thanks for the module, despite is outdated a bit but still works :)
Module Multiple Features 1.5.3
https://addons.prestashop.com/es/busquedas-filtros/6356-multiple-features-asigne-caracteristicas-sin-limite.html
Free of Malware & Backdoors