Every month we will release limited edition merchandise (only available for that month!) designed to motivate the wearer to reach new heights and attain their goals!



Gup Belt T-Shirts

*You may only purchase and wear the color of YOUR belt. If you are seen wearing a color different than your rank you will be kindly asked to not. Check out our other t-shirts for color variety!*


*Only available to those students enrolled in the Black Belt Club*

Monochomatic Collection

Online Store Return Policy

At Cornerstone, we are committed to providing our customers with high-quality products that meet their expectations. Our sales policy is designed to ensure a transparent and smooth shopping experience for all our valued customers. Please take a moment to review our sales policy before making a purchase.

1. All Sales Are Final: All sales made through our store are considered final. Once a purchase is completed, it cannot be canceled, exchanged, or refunded unless the product received is damaged or exhibits manufacturing defects.

2. Returns and Refunds for Damaged Goods or Manufacturing Defects: In the event that you receive a product that is damaged or has a notable manufacturing defect, you may be eligible for a return and refund. To initiate the return process, please follow these steps:

1. Contact our Customer Support team within 3 days of receiving the product.

2. Provide clear photographs and a detailed description of the damage or defect.

Our team will review your request and, if deemed valid, provide instructions on how to return the item. Once the returned item is received and inspected, we will assess the damage or defect and process your refund accordingly.

3. Eligibility Criteria: Returns and refunds will only be accepted if the product is:

1. Damaged during shipping.

2. Received with noticeable manufacturing defects.

Products that have been used, altered, or damaged due to customer negligence will not be eligible for returns or refunds.

4. Exclusions:The following situations are not covered by our return and refund policy:

1. Change of mind or buyer's remorse.

2. Minor variations in color, texture, or design that do not affect the functionality of the product.

3. Normal wear and tear resulting from regular use.

4. Products damaged due to improper handling, misuse, or neglect.

6. Contact Us: If you have any questions or concerns about our sales policy or a specific purchase, please don't hesitate to contact our Customer Support team. We are here to assist you and provide the best possible solutions.

By making a purchase with Cornerstone, you agree to abide by the terms outlined in this sales policy.