Excellent Condition YONEX STB Innerwear/Underwear (Soft Tennis/Badminton) Women's: For Women Athlete Model STBA1507 S Size ¥9,350 (Tax Included) Worn a few times. STB is high-performance underwear developed for all athletes, focusing on core (body core) balance. Based on the latest biomechanics, it achieves a core balance design centered on the pelvis for movements in three directions: front and back, left and right, and rotation. By effectively placing compression materials on the muscle origin, insertion, and muscle recovery, it guides the muscles and skeleton to the best position, maximizing the athlete's performance. Please purchase only if you understand that this is a used item. As this is a private sale, there may be oversights regarding stains or fraying. Thank you for your understanding. Please do not purchase if you are looking for a perfect product.