The band actually keeps them in place!!!
"I love most of Peloton apparel, always soft usually comfortable but even the sports bras I liked still never had a band that actually kept my boobs in the “upper section!” I’d always need to adjust as some point. This bra actually does not let them fall below and it’s doesn’t do it in a suffocating way either. It feels a little tight going over your head but once it’s on, it stays in place and I found quite comfortable. And i usually wear sports bras all day everyday and I really liked this one!"