Better Bodies Glute Force Fill out those shorts and tights with buns of steel. Better Bodies Glute Force is the perfect training partner when you want to target and activate your glutes. Use them to augment your gym training, spice up your in-home workout, or why not pack them in your suitcase when you are on the road. Available in two different resistance levels, heavy, medium and light Size: 33cm / 13 inch Material: Cotton with rubber for high stretchability Heavy- Wash Green: 75% Cotton, 25% Rubber Light- White: 85% Cotton, 15% Rubber Features: Activates the glutes and provides an effective workout