Birch Boot Shapers are designed to hold the boot upright to avoid cracking and creasing of the leather. They expand to the shape of the boots without stretching them. The Boot Trees measure 42cm including the spring mechanism. Maximum width is 15cm (6"). Please note that this product is not a Boot Stretcher but a Boot Shaper. It is designed to keep boots in shape to avoid creases and cracks to the leather and not stretch them. NO MORE BAGGY BOOTS: No one likes cracked, creased or baggy boots. Boots do require dedicated maintenance in order to stay in shape. Birch Boot Shapers will help to keep them in shape for years ANTI CRACKS AND CREASES: These quality boot shapers prevent your favourite boots from cracking and creasing. Allows air circulation and prolongs the life of the boots SPRING-LOADED MECHANISM: Birch Boot Shapers give boots exactly the right amount of tension that is needed. They do not overstretch. Work with all types of boots, whether gents or ladies PRACTICAL: Birch Boot Shapers are very easy to use. No assembly required. Just place inside your shoes and let them stay in shape. Simple one hand function. Saves space in your floor or shelf. 1 package contains 1 pair (2 pieces). BRAND HERITAGE: Birch brand by Charles Birch est.1965; A UK brand by a family owned business, has a wealth of experience in the shoe care industry and renowned for bringing high quality products to the shoe care arena.