Only slightly used on the back, otherwise it's almost pristine. ◇Diet Slippers◇ Living in this era, we often sit for long periods. Due to this, we lack exercise, leading to a decrease in muscle mass, which can cause pelvic misalignment and often leads to lower back and back pain. UTUNE, with the premise of "making the world more comfortable," aims to find solutions for these ailments, which is why we developed these core training slippers. ◇Aim for Beautiful Posture with the Angled Sole◇ The angled sole makes you feel like you're "about to fall backward," unconsciously encouraging you to maintain correct posture, easily improving back and lower back pain caused by poor posture. The raised toes stretch the lower body, and you have to engage your lower abdomen, hips, and calves, so you can train your core without any other exercise. Because the heel is low, focusing your center of gravity backward corrects a forward-leaning posture, allowing you to stand and walk gracefully.