SPECIAL DESIGN: Designed for feet with high insteps. The instep and length shoe stretcher transforms any shoes into perfectly fitting, comfortable shoes. It saves you weeks of time breaking in a new pair of shoes. With Acsergery shoe trees, your shoes can be stretched both in length and height. .PREMIUM QUALITY: It is made of polyurethane plastic and stainless steel. Sturdy and more durable than ordinary wooden variants. In addition, it is antibacterial and effectively prevents odors. .PERFECT FIT: It also comes with Acsergery small built-in holes on the instep area. Plugs inserted into the holes can stretch the shoes in problem areas, where pinching occurs. Works well 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 might want to try a shorter period of time first, as shoes that are too loose don't feel good either.