COWIN has a straightforward 18% discount on your entire order right now, and it's the brand's headline offer for most shoppers. The choice between your available deals really comes down to what you're buying and how much you're spending, since COWIN is running a Father's Day sale and other promotions that may work out better than the flat 18% depending on your basket.
On a smaller order under $100, the 18% off deal is your best bet. You'll get a solid discount on everything in your basket with no minimum spend required, so it's worth taking over speculative savings elsewhere.
On a mid-size order between $100 and $200, compare the 18% flat discount against what Father's Day or the other selected products sale might deliver. If you're buying items that fall within the Father's Day promotion or the selected products range, calculate both: the 18% off your order total, and then the discount from whichever sale your items qualify for. Take whichever one saves you more money.
On larger orders over $200, the same logic applies but the stakes are higher. The 18% discount becomes increasingly attractive at bigger totals, but if most or all of your items are part of the Father's Day sale or selected products promotion, those deals could outpace 18%. Run the numbers on both before you checkout.
If you're a first time customer or returning shopper without a newsletter account, signing up to COWIN's newsletter will open the door to special offers and promotions beyond what's currently listed here. However, apply the same basket size logic to your current shop: use the 18% off or Father's Day deals for today's purchase, then keep your eye on future newsletter-only offers going forward.
Remember that at checkout, you can only use one offer at a time. Check each discount your items qualify for, calculate the actual dollar savings each one produces, and go with the option that puts the most money back in your pocket.