Squeem Perfectly Curvy Waist Trainer Shaping Brief (26RS). The Squeem Perfectly Curvy Waist Trainer Shaping Brief 26RS has a front closure with high-level shaping at your waistline, boning for stomach, and lower back support. Squeem's Perfectly Curvy Waist Trainer Shaping Brief is made of natural rubber/cotton/polyamide/elastane.