ADJUSTABLE: The length of the shoe stretcher can be adjusted from 7cm/2.76inch to 12cm/4.7inch, flexible and easy to adjust to suit your own different length needs. FUNCTION: These mini shoe stays help expand your shoes, make them more comfortable, and help you keep your shoes in shape. Outer Material: Plastic Inner Material: Stainless steel Sole: Stainless steel EASY TO USE: Insert the shoe rack into the shoe, turn the red plastic handle clockwise to widen it to the proper width, and leave the shoe support inside the shoe for more than 24 hours. PORTABLE & CONVIENT: The shoe stretchers is very small and easy to carry, whether you're at home, traveling or camping, it is easy to carry without taking up too much space. WIDE APPLICATION: No matter what kind of shoes you use, you can stretch your shoes for a perfect fit, the shoe stays are very helpful for you.