According to a MacRumors article from August 2020, each year Apple “hosts a company wide fitness challenge for its employees at corporate offices and retail stores around the world, tasking participants to close all three of their Apple Watch Activity Rings every day of the month.”
This t-shirt was originally owned by an Apple employee who successfully completed this challenge. The shirt is black in size Large. The front logo features a stylized “2020” design that resembles the three Activity rings used on the Apple Watch Activity app.
Although Apple previously held this company-wide challenge in February, the COVID-19 pandemic of 2020 delayed the challenge until July. The shirt was shipped with a congratulatory “celebrate” white card printed in metallic gold.
Source: MacRumors