The term 'SOFT BOOT LINER' is a job description for a PAC, which stands for Personal Activity Coordinator. A Personal Activity Coordinator is responsible for organizing and leading recreational activities for individuals or groups. The Soft Boot Liner is a type of PAC who specializes in activities that involve soft boots, such as skiing, snowboarding, and ice skating. They are responsible for providing instruction and guidance to participants, ensuring safety, and helping participants to develop their skills.