The textured spots on the bottom of the socks - from above the ball of the foot and back to cover the entire heel area, to ensure a true no-slip grip on tile and hardwood floors. Trampoline socks keep your feet firmly planted on your mat.Stylish design on the instep and anti-skid frictions on the bottom, providing an absolutely effective anti-skid effect, perfect for Yoga, Pilates, Barre, Bikram, Ballet, Fitness, etc.