It's super simple, simply add all of your items to the cart and watch the magic happen. In your cart or on the checkout page you'll see the discount added. Remember if you are doing the 'buy 3, get 2 free' then you need to have a minimum of 5 items in your cart. If you are doing the 'buy 6, get 4 free' then you will need a minimum of 10 items in your cart. Remember: You get to choose your free pairs plus get FREE First Class Shipping on orders over $35.