Which sizes fit the waist trimmer belt? Customer Support May 18, 2023 23:30 Our waist trimmer belt is designed to fit all sizes perfectly. Just put it around your waist and close it when it feels well-adjusted. Related articles Is it safe to use with any of the other Gluteboost products? How do I apply the SlayIt cream? Can I use the Waist Trimmer belt without the cream? Comments 0 comments Please sign in to leave a comment.