The first popular tracksuit took off in 1967 and it started a fashion revolution. Athleticwear had always been a thing, but the tracksuit presented something new — a way for people to seamlessly transition between relaxation and exercise. Stylish enough to wear outdoors, and comfortable enough to wear at home, the tracksuit invented the concept of athleisure.

And over the next 50 years, athleisure went from a sporty niche sub-culture to the look of the golden age of hip-hop, in the process until the late 2010s and early 2020s, when it became the . There is no doubt that when it comes to , comfort is king, and athleisure is such a powerful trend that even if you don’t self-identify with the fashion movement, you undoubtedly own a number of athleisure pieces in your wardrobe. While athleisure has come in all sorts of different fits and silhouettes throughout its 50+ year history, when the style became a household name in the 2010s it had a clearly defined look — tight, form-fitting, and flattering.

But an interesting trend started bubbling up across fashion in recent years as styles became more relaxed, roomier, and more obscuring for the first time since the ‘90s. Right now, the dominant look in modern fashion, streetwear or otherwise, is baggy. So what is athleisure, a fashion movement known for its sleek silhouettes to do? Simple, the answer is to go baggy, and Under Armour’s Unstoppable Collection is leading the way.

The Unstoppable Collection is an extensive set .