Why does the Under Armor logo have two looks?

The details of the logo are as follows:

The Under Armor logo has two shapes, one is composed of the letters "Adidas" and three slashes, and the other is a circle with a middle It’s the “UA” letters for “Under Armor.”

The early Under Armor logo adopted a smooth line design and a simple color scheme, which fully reflected the company's sporty, energetic and innovative image. Later, Under Armor changed its logo to a new one. The new logo is simple and elegant, with the brand's English name Under Armor and the abbreviation "UA" as the main body. Below it is the image of a sharp and straight cutting knife. Below the cutting knife is Under Armor's classic The slogan "Protect This House" is mainly composed of cool colors such as blue, black and red, which has a strong visual impact.