Under Armour is considerably bigger than Lululemon. Under Armour's total revenue in 2018 stood at $5.2 billion - almost 1.5 times more than Lululemon's $3.2 billion.
However, both companies have added roughly $1.3 billion to total revenues since 2015. While this represents an average annual growth rate of 9.4% for Under Armour, the growth rate is considerably higher at 17% for Lululemon.
This strong growth for both companies has been primarily led by their women's apparel business. The companies have continued to introduce new fabric, colors, styles and prints that have allowed them to retain and attract customers.
Moreover, both companies changed their strategies in a timely manner to accommodate a variety of activewear products in their offerings.