Tread Labs currently has the $10 off voucher at the top of this page, a simple fixed discount that is best for small to mid size purchases of full price insoles or footwear. The same page also lists a free top cover with any insole, an outlet sale up to 52% off, a sandal clearance at up to 40% off and best selling insoles from $65. Use the $10 off voucher when you need a straight price cut on a non sale item; use the sale prices when the markdown saves more.
Very small purchases and single full price insoles: If you are buying a full price insole or footwear and the item is not already in a sale, use the $10 off voucher above. For example, on a $65 best selling insole (not on sale) the $10 off voucher takes $10 off, so you pay $55, a $10 saving.
Buying a free top cover with any insole: If you want a top cover at no extra cost, apply the free top cover code at checkout. That offer gives you the accessory free while stocks last; it is useful when the accessory would otherwise be a separate purchase. The free top cover code cannot be combined with the $10 off voucher if both are treated as promotions at checkout.
Items in the outlet sale: Sale styles marked in the outlet can be up to 52% off already. Those product pages show the reduced price before you buy, so the outlet discount usually beats the $10 off voucher on higher priced items. For example, a $100 item reduced by 52% is $48 after the outlet discount, a $52 saving compared with the original price; the $10 off voucher cannot be combined with other promotions, so you must pick the outlet price.
Sandal clearance: Sandals with up to 40% off are already reduced on the product page. A $120 sandal at 40% off costs $72 after the discount, a $48 saving; again the voucher cannot be stacked with this sale price.
Buying single low cost items under the sale price: If a sale price or free top cover is not available on the item you want, the $10 off voucher is the straightforward choice.
When choosing, compare the final totals and take whichever leaves the lower payment. Remember the $10 off voucher cannot be combined with other promotions, so you must either use the voucher or take the sale or free accessory offer shown on the product page; pick the one that results in the lowest final price.