SPECIAL DESIGN: Designed for feet with a high instep. The instep and length shoe stretcher turns any shoes into perfectly fitting, comfortable shoes. It saves you weeks of time breaking in a new pair of shoes. With the Acsergery shoe stretcher, your shoes can be stretched in both length and height. .PREMIUM QUALITY: It is made of polyurethane plastic and stainless steel. Sturdy and more durable than ordinary wooden shoe stretchers. It is also antibacterial and effectively prevents odor. .PERFECT FIT: It also comes with Acsergery small built-in holes in the instep area. Plugs inserted into the holes can stretch the shoes in problem areas where it pinches. Works great with Acsergery leather, suede, and other natural materials. .EASY TO USE: Follow the instructions below, you usually need to leave the stretcher in for at least overnight, and sometimes for 24-48 hours. The longer you leave the stretcher in, the more the shoes will stretch, so you may want to try a shorter time first, as shoes that are too loose don't feel good either. .