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To use a Theory coupon, choose a current offer and copy the code exactly as displayed, including capitalization if required. Add eligible items to your shopping bag, proceed to checkout, and enter the code in the promotion or discount field before completing payment. Select Apply and confirm that the reduction appears in the order summary. Some offers apply automatically, so always read the coupon terms before ordering.

Theory coupons should be checked carefully before use because promotions can have limited validity, minimum-spend requirements, or exclusions. A trustworthy offer normally includes clear terms, an expiration date, and information about eligible products or regions. If a code does not work, check for typing errors, confirm that the offer has not expired, and make sure another promotion is not already applied. Only the final checkout total confirms whether the discount was accepted.

Theory promotional codes may exclude sale items, new-season collections, accessories, gift cards, or limited-edition products. Some codes are restricted to one use per customer, cannot be combined with other discounts, or require a minimum purchase value before tax and shipping. Offers may also be limited by country or customer account. Reviewing the complete terms is important, especially when purchasing discounted merchandise or items with special delivery conditions.

Theory generally presents the payment methods available for your delivery country during checkout, which may include major credit or debit cards and other online payment options where supported. Shipping costs, delivery estimates, and free-shipping thresholds can vary by location, order value, and promotion. A coupon usually reduces eligible merchandise rather than shipping fees. Check the checkout page for the latest delivery charges and make sure your address is entered correctly.

Items bought with a Theory discount are usually subject to the brand’s standard return policy, but the product must meet the stated conditions, such as being unworn, unwashed, and returned with original tags and packaging. Sale items or promotional purchases may have different rules, and some products can be final sale. Before returning an order, review the policy for your country and keep your order confirmation, since refunds normally reflect the discounted amount paid.