L (used for 13-14mm)M (10-12mm for use)S (9-10mm use)XL (for use with 15-16mm)Note: Please check the right size before you buy, the size is shown in Figure 2Slip Resistant - Never fear slipping again because these slip resistant protectors will stabilize you on slippery surfaces and treacherous terrain.Heel Protector - The non-slip protectors also protect your heels from external and walking friction, saving you hundreds of dollars in shoe repair bills and downtime.Virtually Invisible - Virtually invisible, slip protectors are handsome Yes, some would say it even makes your shoes look better, after all, these slip protectors are designed with style in mind, because while safety always comes first, your appearance comes second.Stomp with confidence anywhere you go - slip guards have your backYou go girl, walk the runway to success, because these bad boys will be watching your steps like a hawkRest assured that your heels will be protected by these macho men who are designed to make your steps last.Packing list: 10 non-slip protectorsDue to differences in different monitors, the picture may not reflect the actual color of the item.Due to manual measurement, please allow for minor size errors.