Help correct your golf position for about 10 minutes, swing and knock it out.During the swing, both arms avoid touching the boxes on both sides and effectively adjust the distance between the arms and the body.The indicator line on the box guides the degree of waist turning.Hight quality oxford cloth and foam material, breathable and comfortable, high elastic fabric, light weight, easy to carry.Help you keep your best posture.Specification:Material: Oxford Cloth, SpongColor: BlackTeens: Waist Belt 920x120mm/36.22x4.72 inch, Square Box: 75x75x125mm/2.95x2.95x4.92inchAdults: Waist Belt 1100x150mm/43.31x5.91 inch, Squzre Box: 150x150x150mm/5.91x5.91x5.91 inchPackage Includes:1 Piece Golf Swing Training Aids