Why Do New Shoes Smell the Way They Do?
The new shoe smell comes from the array of materials and chemicals used in shoe manufacturing. These range from synthetic leather, rubber soles, adhesives, dyes, and finishes—all of which release volatile organic compounds (VOCs) that contribute to that distinct scent.
Many of these materials are made from synthetic compounds that, when newly manufactured, give off gas. This process, known as "off-gassing," releases chemicals into the air, creating the fresh, factory-fresh scent. Over time, this smell fades as the VOCs evaporate and the shoe becomes exposed to fresh air.
Chemicals in Shoes: What’s Behind That New Shoe Smell?
Let’s take a closer look at some of the key chemicals involved in shoe manufacturing and their roles in creating that scent:
1. Formaldehyde
Formaldehyde is a commonly used chemical in various consumer goods, including shoes, as it helps with the “setting” of materials and the prevention of wrinkles. Although formaldehyde provides durability and stability to fabrics, it’s also known to release strong odors when the shoes are first out of the box.
2. Acetone
Acetone is a chemical solvent frequently found in shoe adhesives and glues. Known for its quick evaporation, it helps hold different shoe components together, such as soles and uppers. Acetone contributes a faint, fruity smell to the new shoe aroma. Though acetone is often classified as a VOC, it is widely used in manufacturing, especially where fast-drying adhesive is needed.
3. Polyurethane (PU)
Polyurethane is widely used in shoe soles because of its durability, flexibility, and cushioning properties. It’s a type of plastic that emits VOCs when new, contributing a faint chemical smell that fades over time. In addition to polyurethane, some manufacturers may use polyvinyl chloride (PVC) for certain shoe parts, which also releases a specific “plastic-like” smell.
4. Toluene and Benzene
Found in certain glues and rubber-based components, toluene and benzene add to the unique scent of new shoes, but they are some of the more concerning chemicals due to their potential health effects with prolonged exposure. These chemicals can have a slight gasoline-like aroma and can be particularly potent when the shoes are freshly unboxed.
5. Phthalates
Phthalates are added to plastic materials to increase flexibility and durability. While they don’t have a strong smell on their own, they can contribute to the overall “chemical” profile of new shoe scent. Like some other VOCs, phthalates raise health concerns over time, especially if used in higher concentrations.
6. Styrene
Styrene is used in many synthetic rubbers and foams, such as those found in sneaker soles and inner cushioning. It’s known for a faintly sweet odor that’s easily recognizable in certain shoes. Styrene is what gives foam-based shoes a portion of their odor, and it is particularly noticeable in new athletic shoes.
Should We Be Concerned About New Shoe Chemicals?
The occasional sniff of new shoe smell might not be harmful, but prolonged exposure to VOCs in closed or poorly ventilated spaces could be. Many of the chemicals responsible for that “fresh from the box” aroma are classified as VOCs, and some can cause symptoms like dizziness, headaches, or respiratory irritation when exposure is significant.
For this reason, it’s always wise to let new shoes air out for a while before wearing them. This allows the chemicals to off-gas naturally, reducing the concentration of VOCs you’re exposed to.
At Freely Rooted Co, we’re committed to minimizing chemical exposure by choosing materials that align with our health-focused values. Instead of relying on synthetic materials that off-gas harmful chemicals, we use GOTS-certified organic fabrics, natural real leather, and sustainable cork insoles rather than synthetic foams. These choices not only reduce VOCs and limit exposure to potentially toxic chemicals, but they also provide durable, high-quality shoes that support a healthier environment for our kids. With every material thoughtfully selected, we’re taking steps to create products that align with a cleaner, greener lifestyle—helping families take one more step toward a toxin-free future.
