Performance footwear and apparel brand While on Earth debuted the CMC, its most explosive trainer yet, created in collaboration with co-founder and San Francisco 49ers running back Christian McCaffrey. Designed for athletes who move with intention and finish with force, the CMC brings McCaffrey’s experience training to be one of the NFL’s best into a versatile performance shoe built for explosive training and dynamic workouts.
McCaffrey, who joined While on Earth as a co-founder and investor in August 2025 after a longtime partnership with Nike, brings decades of experience on the field to the design details of the new trainer. The launch of the CMC, a comfortable and supportive trainer, marks a significant next chapter in McCaffrey’s partnership with While on Earth.
“From the early days of joining While on Earth, I knew I wanted to create a shoe that could keep up with how I train,” said McCaffrey. “The CMC offers the stability and control I need to train explosively, without sacrificing comfort and versatility beyond the gym. Years of training can take a toll on the body, and my footwear needs to be durable enough to handle everything I put it through. I have personally tested this shoe for countless hours over the past year, and I have total confidence in our final product.”
“We put a lot of thought into every detail,” said Todd Meleney, co-founder and CEO of While on Earth. “The CMC had a clear design brief from the first meeting Christian and I had together: create the most stable and supportive training shoe on the market without sacrificing comfort and versatility. We nailed it with this product, and we can’t wait for athletes to put it to the test.”
Available for both men and women, the CMC represents While on Earth’s continued evolution as a performance brand creating versatile footwear and apparel for those who move, go and do.
