T-shirts will be included in most Mystery Blocks throughout the year, but maybe not all. Adult t-shirt selections are based on standard adult unisex t-shirts sizes. Depending on the brand they may differ in how they fit, but we can always update your size selection if there is an issue. IMPORTANT: Please note when you update your size it will NOT update your remaining shipments, only after your next renewal. Please contact us to update you CURRENT subscription!