The dryer has vertical and horizontal air holes to ensure even heat distribution! It is definitely worth a try if you suffer from smelly trainers, sweaty or damp shoe boots, and athlete's foot. It fits many types of shoes boots, sneakers, leather shoes, sports and safety shoes etc. Suitable for regular or walking shoes, cloth shoes, boots, rain boots, gloves, socks, and more. The body is distributed with holes, the hot air circulates to dissipate heat and dry it with warm air to avoid deformation, degumming, and cracking of shoes caused by high-temperature drying.