Mumbai, Jan 11 Actress Sonam Kapoor feels conned by the concept of memory foam mattresses as they have done more bad than good to her. Sonam tweeted on Thursday: "Memory foam mattresses are a con... whole body and neck in bad shape after using them. Please don't fall for the marketing bull." Currently, the actress awaits the release of her next film "Padman". The film, directed by R. Balki, is based on Arunachalam Muruganantham, who created a revolution in the field of affordable menstrual hygiene. It even stars Akshay Kumar and Radhika Apte. Produced by KriArj Entertainment, Mrs. Funnybones Movies, Hope Productions and Columbia Pictures, the film will release on January 26.