Fatigue Relieve: The super comfortable and cute Sonic eye mask prevents eye pressure, helps relieve pressure on the nerves and blood vessels in the eyes, relieves fatigue and improves the sleeping environment. Soft Material: Sonic sleep Mask is made of polyester on the surface and soft and comfortable flannel on the back, which is skin-friendly and natural, light and breathable, easy to clean, relieves eye pressure and fast asleep. 3D printed using a thermal sublimation process to create a durable pattern that will not fade. Elastic Strap: It has soft elastic headband that will not move and not easy to fall off when sleeping. It fits any eye position of the mask without tangling hair. Size: The eye mask size is 19.5cm x 10 cm. Fits most people's head sizes. Suitable for ladies, girls, children, men and boys. This is the perfect gift for your child. Occasion: sonic sleeping Mask covers are suitable for travel out, Business trip, Office lunch break, home, train, hotel, aeroplanes and anywhere, you can enjoy a complete blackout to sleep, relax or recover while you travel. Sonic blindfolds will help your child to fall asleep quickly.