Thermoplastic Rubber soleMore comfortable: Made of high quality PE and TPR to ensure a strong hardness, with auxiliary cutting lines, adjust them according to your needs for completely suitable. Breathable design keeps the shoes dry and extend the life of your precious sneakers.️More convenient: Superb and lightweight shoe tree that can be used for storage and travel. Intended to be put inside shoe and left inside shoes for optimal performance.More suitable: Each package has 4 pairs of shoe creases protector in 2 colors black and white meet your daily needs conveniently. Completely compatible with most sneaker footwear.️️More choices: Each package includes 4 pairs of durable sneaker creases protector. Different colors have different hardness, please choose your suitable one.Kindly note: Do not use it during exercise. If your shoes are tight and not loose, it is not recommended to use it in this way. Product Description 1 1.5 mm Thickness 2 Breathable Design 3 Adjustable Size Compatible Shoes Type Recommended Quantity 6 Pairs Quantity 6 Pairs Quantity 4 Pack Applicable Work for most of sneakers, like AJ, AF, Dunks and more. Applicable Work for mules, Slips-ON, high heel, sneakers, boots and more. No size limition. Applicable Work for most of shoes, size up US 14. Do they fit size 13？ Yes, and you can trim the size until totally fit. Can I wear them to work or walk? Yes, you can wear them when you walk or work, but we don't suggest that wear them exercising. Will these protect boots, like timberlands? Yes, they will provide support and release the crease for your boots, sneakers,like AF1, AJ dunks and more. Do I need to take them out when put my shoes in organizer? You can keep them in your shoes and provide necessary support for your shoes.