The term 'Sites for Sweaters' can refer to two different crossword solutions: SPAS (4 letters) and SAUNAS (6 letters). SPAS are places where people can go to relax and enjoy various treatments such as massages, facials, and body wraps. They often have pools, hot tubs, and saunas. Saunas are rooms or buildings that are heated to a high temperature and used for relaxation and health purposes. People typically sit in the sauna to sweat out toxins and improve their circulation.