1. Button design, easy to use, not easy to fall off 2. Smooth stitching, exquisite and delicate, soft to the touch, does not hurt the baby's skin 3. TPU waterproof cloth on the back, will not get wet clothes 4. Fast water absorption, easy to clean, lightweight and portable 5. Material: crystal velvet, waterproof cloth 6. Single weight: about 20g 7. Single size: about 20 x 29cm, neck circumference about 32cm