Can't see any restrictions - 40% off the second pair at Sunglass Hut:
40% OFF SECOND PAIR | AUTOMATIC AT CHECKOUT
1. 40% discount on full-priced second pair of equal or lesser value of the first pair. 2. Both pairs must be purchased in a single transaction. 3. Discount applied automatically at checkout. 4. Offer is redeemable at Sunglass Hut online and in store. 5. Excludes Chanel, Oliver Peoples, Maui Jim, Dior, Cartier, Celine, Oakley Encoder and Oakley Kato Collection 6. Discount is not available on accessories, gift cards or any product other than sunglasses. 7. Offer ends Friday 31st December at 11.59pm AEST. 8. Offer cannot be exchanged for cash. 9. Not to be used in conjunction with any other offer.