Anthony Katz's DIY ice sleeve for Kobe Bryant grew into Hyperice, now valued over $1 billion

Anthony Katz built a makeshift knee sleeve from wetsuit scraps in 2009 to manage basketball-related pain, fitting it with an ice pack instead of relying on plastic bags. After Kobe Bryant's assistant noticed the device and asked for one, the product eventually evolved into Hyperice, a recovery-tech company now backed by top athletes and partnered with Nike.