Quality is excellent. My usual size is M so i ordered the same and i dont regret it, leggings fit me like a glove. My measurements are 99cm hips, 66cm waist and i'm 170cm tall. Material is thin (in a good way) and they're squat proof! I recommend it 100% and seller did communicate. Delivery took a while since my package got stuck at customs (aprox. 28 days).