UNIONBAY currently has a $20 off voucher at the top of this page that takes $20 off when you spend $85 or more on clothing and shoes, and it is best for orders that just clear the $85 threshold. That code is the page lead; use it when an $85 minimum meets the items you want. The other site offers to consider are a 10% off promo, an up to 40% off new arrivals sale (selected styles), free shipping when you buy two or more items, and sign up promotions that give 20% cashback and may include free shipping over $75.
Small baskets under $75: if your cart is less than $75, the $20 off voucher needs an $85 minimum so it will not apply. You cannot use the $20 code here. If you can add a second item to reach two items, you get free shipping from the buy two items shipping deal; otherwise expect normal shipping charges. The signup offers that promise 20% cashback also mention selected products only, so they may not apply to everything.
Carts between $75 and $84.99: the $20 off voucher still needs $85, so it will not work. The signup SMS and email offer gives free shipping on orders over $75 once you sign up, so if you need free shipping and are willing to sign up, that can save shipping costs. The 10% off promo would apply here and may be your best straightforward discount for sitewide items.
Carts $85 to $199.99: use the $20 off voucher at the top of this page for an immediate $20 reduction, since it requires $85 minimum. The 10% promo is available but gives less than $20 until your cart reaches $200. Also check the free shipping for two items if you have two items in cart; that may remove delivery charges in addition to the $20 off.
Carts $200 and above: switch to the 10% off promo. At $200, 10% is $20, and above $200 the percent saves more. For example, on a $250 order the 10% promo takes $25 off, which beats the $20 voucher. If you are buying selected new arrival items that are on the up to 40% off sale, that sale price is likely the biggest saving on those items; the sale applies only to selected styles so compare the sale price to the price after a code.
Buying sale new arrivals or single expensive items: if an item is marked down by the up to 40% sale, use the sale price for those selected styles rather than a sitewide code. For example, a $120 new arrival at 40% off becomes $72, saving $48, which is far more than the $20 voucher.
When choosing between the $20 voucher and the 10% promo, pick the option that leaves the lower total. Use the $20 voucher for orders just over $85. Use the 10% promo once your cart totals $200 or more. Free shipping triggers when you add two items or when you use the signup free shipping over $75, but the signup offers require you to join SMS or email lists or create an account, and the cashback offers apply to selected products only.