Sometimes shoes made of leather go mouldy do you know why?
- Moisture
Mold may begin to grow on the shoe if the air that is immediately surrounding it is very humid. When a shoes inside surface has been subjected to high amounts of humidity for an extended length of time, the shoe will develop mold growth. Mold can begin to develop within the lining or sole of the shoe if moisture is allowed to accumulate there and the conditions are favorable for its growth. This takes place when the internal environment of the shoe becomes wet as a result of moisture such as sweat, precipitation, or condensation.
- the smell of feet
The bacteria that build up on the bottoms of our shoes are the real culprits behind the unpleasant odors that emanate from our feet on a regular basis. Bacteria are responsible for the characteristic odor known as putrescence, which is produced when dead skin cells are broken down. Bacteria flourish in warm, damp conditions, which are created when people walk about barefoot. 
However, as soon as we sit down, our socks begin to operate as a barrier, shielding our feet from the invasion of bacteria and so reducing the amount of bacteria that is present on our feet. However, once we begin wearing shoes with closed toes and heels, our feet are no longer protected, and as a result, bacteria are able to proliferate.
- Temperature
Temperature is another factor that contributes to the easy molding of shoes. If your shoes have been left outside all night and are exposed to direct sunlight, they will be rather warm. This is especially true if they have been sitting in the sun. Shoes that are kept at a warm temperature result in an increase in the internal temperature of the foot. The warmth of the environment causes water to expand at a quicker rate than the rest of its surroundings. As a result, water vapor condenses within the shoe, creating a layer of water that sits between the inner surface of the shoe and the air. 
This leads to moisture, which in turn increases the likelihood of mold growth.
- Dirt
Dirt is a natural contaminant. When people wear their shoes outside without properly cleaning them after walking through mud or receiving sand in them, it gets into their shoes and spreads throughout their feet. In addition to this, walking on rough surfaces causes dirt to become embedded in footwear.
- Food
It is possible for food particles to become lodged under the arch of the foot when they enter shoes and travel there. This food may become embedded in the material of the shoe and remain there until it dries up. When food is allowed to dry out, it can produce odors that are unpleasant and attract pests such as flies and rodents.
- Sweat
During physical activity, it is normal for people to sweat. Unfortunately, a significant amount of the body's essential minerals are lost through perspiration as well. Walking causes these minerals to get into our shoes, where they could end up where no one wants them: contributing to the smell of our feet. 
- Additional components
Rubber, artificial materials, synthetic fibres, plastic, leather, cotton, nylon, and wool are some examples of other materials that could potentially contribute to unpleasant foot odour. Moldy Shoes: Why? How to avoid mold on shoes in closet Mold and mildew don't simply grow on shower curtains and AC units. Mold grows anywhere there's moisture. It likes moist, gloomy places, like your shoe closet. Moldy Shoes Your shoes got moldy for one of two reasons. You put away wet shoes. Mold in the wet, dark closet crept to your shoes. Mold grew because conditions were favorable. That's bad. Good health requires finding the source of the disease and eradicating it. My Pure Environment is a mold expert. We'll eliminate all mold so you can breathe easily. Moldy shoes: can they be saved? Moldy shoes or closets may be salvageable Many of us would like to save our shoes from the trash. If you find mold in your closet but not in your shoes, clean your closet anyway. Shine your shoes outside in the shade Wear a mask and gloves if there is mold. 
If possible, remove laces and insoles. Use a soft brush or dry cloth to clean and disinfect the shoes. Wipe each shoe from the inside out with a cloth dampened with the solution. Q tips can reach into tight spaces. Rinse the shoes with plain water and air dry them. After the shoe dries, keep going Rinse the shoes with warm soapy water and a cloth Let the shoes air dry again. Mold Resistant Shoes The smell of moldy shoes Indoor mold can cause toenail fungus. Mold can cause asthma and breathing problems if inhaled. Mold holes are common. Genetically, 25% of the population is susceptible to mycotoxins. save The silicone sleeve helps absorb moisture in the cabinet. You can also keep it in coat pockets or between layered clothing Shoe racks should be metal cabinet. Mold grows better on wood and textiles than on metal. Air dryer, air drying Leave your shoes outside to dry after hiking in the rain, jogging in the pool, or working out at the gym. 
As a precaution, spray the shoes with white vinegar and water and then dry them. Rewriting Mold can grow in wet insoles. This happens to a lot of people, especially construction workers, garden keepers, and cooks. If your shoes get wet, change your socks often. If possible, bring a second pair of sneakers or a spare and let the first pair dry. wardrobe mold cleaning If you find mold in your closet, mold spores may have spread to adjacent rooms. Stop DIY mold repair and call a professional. My Pure Environment removes mold from closets and homesWe serve Greater Boston. Learn about our mold recovery methods and book an appointment when you're ready.