Under Armour, a brand known for its innovative sportswear, primarily uses a blend of different materials to enhance the performance attributes of its clothing and accessories. These materials often include polyester, elastane, and nylon, among others, designed to provide moisture-wicking, elasticity, and comfort. While polypropylene is known for its lightweight and moisture-wicking properties, it is not one of the main materials typically advertised by Under Armour in their product descriptions. Instead, Under Armour focuses on using a blend of materials that can offer durability, stretch, and breathability, tailored to the specific needs of athletes and casual wearers alike.

Polymers are large molecules composed of repeating structural units called monomers. They play a crucial role in natural and synthetic materials. The four main types of polymers are thermoplastics, thermosetting plastics, elastomers, and biopolymers. Thermoplastics, such as polyethylene and polystyrene, are moldable at high temperatures and solidify upon cooling, offering versatility in applications like packaging. Thermosetting plastics, like epoxy resins, undergo a chemical reaction during processing, creating strong, heat-resistant networks ideal for electronics and automotive components. Elastomers, such as natural rubber, are characterized by their elasticity, crucial for products requiring flexibility, like tires and gaskets. Biopolymers, including cellulose and proteins, are naturally occurring polymers essential for life processes and are increasingly used in sustainable materials due to their biodegradability. Understanding these types helps in selecting appropriate materials for various applications.

Polymers are large molecules composed of repeating structural units called monomers. They play a crucial role in natural and synthetic materials. The four main types of polymers are thermoplastics, thermosetting plastics, elastomers, and biopolymers. Thermoplastics, such as polyethylene and polystyrene, are moldable at high temperatures and solidify upon cooling, offering versatility in applications like packaging. Thermosetting plastics, like epoxy resins, undergo a chemical reaction during processing, creating strong, heat-resistant networks ideal for electronics and automotive components. Elastomers, such as natural rubber, are characterized by their elasticity, crucial for products requiring flexibility, like tires and gaskets. Biopolymers, including cellulose and proteins, are naturally occurring polymers essential for life processes and are increasingly used in sustainable materials due to their biodegradability. Understanding these types helps in selecting appropriate materials for various applications.

Sodium oxidizes faster than iron when exposed to air or water. This rapid oxidation is due to sodium's lower position in the electrochemical series, meaning it has a higher reactivity compared to iron. Sodium easily loses its outer electron to form sodium ions, creating a visible reaction often in seconds in the presence of air or water. Iron, although also reactive, forms an oxide layer more slowly due to its electronic configuration that makes it less eager to lose electrons. The rate of oxidation for both metals is influenced by environmental conditions, but sodium's inherent chemical properties ensure it reacts much quicker under the same conditions.