The offer of receiving a free Silicone Case with the purchase of Bose QuietComfort Ultra Earbuds (2nd Gen) or Ultra Open Earbuds is valid only while stock lasts. This offer may not be combined with any other offers or applied to previous purchases. Bose reserves the right to remove the offer at any time. In the event of a product being returned, any free product must also be returned before we can refund your purchase.