Some of our customers prefer different sizes in each style, for example, they may prefer small briefs and medium boxer briefs. To do this, you would need to set up two subscriptions. In the My Account section, you'll be able to easily switch between subscriptions to update your preferences should you need to. You can also change the subscriptions to deliver every 2 or 3 months, so you dont wind up with too much underwear, and dont forget, US orders of 2 or more pairs get Free Shipping.