Pay attention: Before you clickAdd to Cart, please make sure it is Sold by Keewen Socks which the information is underneath it. Because our listing has been hijacked by other sellers and many people bought fake products(total different style/very poor quality) and leave us a negative review/feedback. *Material: Coolmax Polyester yarns are engineered to move moistrue away from your skin, to be fast drying and enhance comfort. Lycra Spandex improves fit and long term comfort. *Size: The wrong size will cause the liner to slip down in shoes. So our liner socks come in 3 different sizes: US Women Shoe Size 4-7// 5-10//8-12. You also can choose the suitable size liner for your lover at the same time. Perfect match your loafers,flats,high-heels,etc. *Funtion: Added BIG silicone gripper pads to the heel which will keep the liner in place the all day along. *Care: Easy to take care of, machine or hand wash and dry. Lycra spandex to helps the socks to keep the shape for a long time service.