Seven secrets compression leggings Seven Secrets leggings have a special 3D weaving that supports, massages and insulatesâ€"as well as gently smoothing your silhouette! The 3D weave in the undergarment functions in the following ways ~Shapes and smooths waist for extra definition~Compression and support for thighs~Extra support around the upper knee area~Tummy control pulls you in for a flatter stomach~Lower knee and calves support~Bottom and thigh support~Ankle support