What the numbers say
On an order at $100.00, a pair of socks costs $9.33: its unit cost and one more pick. The customer pays the same, so the order's margin falls from $3.18 to −$6.15.
With the gift, the order earns nothing, so no amount of extra conversion pays for it.
The gift's retail value ($15.00) is what the customer sees; its cost is what the margin pays. A $15 pair of socks, costed at Allbirds' reported gross margin.
The cost structure, and where it comes from
| Price | $100.00, a pair of sneakers. Allbirds, Men's Tree Runner, read 13 October 2026 |
|---|---|
| Unit cost | $59.00. From the income statement: revenue $152.5 million, gross profit $62.6 million, a gross margin of 41.0%. Allbirds (Smartbird, Inc.), annual report (Form 10-K) for the year ended 2025-12-31, read 13 October 2026 |
| Pick and pack | $3.20 per order and $0.48 for each extra item. Fulfill.com, 3PL pricing benchmarks (The Fulfillment Advisor 2025 survey of 600+ warehouses), read 23 September 2026 |
| Shipping label | USPS Ground Advantage, commercial, Zone 5, by weight rounded up to the pound: 1 lb $9.29 · 2 lb $10.50 · 3 lb $12.12 · 4 lb $13.89 · 5 lb $14.53. Packed weight is an assumption: 2.5 lb per unit. USPS Notice 123, USPS Ground Advantage Commercial, Zone 5 (effective 4 October 2026), read 13 October 2026 |
| Card fees | 2.9% + $0.30 per order: Shopify Payments' online rate for a standard card on the Basic plan in the United States. Higher plans pay a lower rate, and premium cards a higher one. Shopify's pricing page for the United States, online standard card rates, read 12 October 2026 Rates by plan and country |
| Refund reserve | 19.3%, NRF's estimate of online sales returned in 2025, across all categories. NRF and Happy Returns, 2025 Retail Returns Landscape (15 October 2025), read 23 September 2026 |
| Gift | A pair of socks: unit cost $8.85, retail $15.00. A $15 pair of socks, costed at Allbirds' reported gross margin. |
The offer, as an agent writes it
An agent writes this offer as one document for Offer Suite's API, validated against the offer schema. Below is one option of it: what the buyer gets and the price it promises. Offer Suite checks with a real cart that checkout charges exactly the prices above.
Show one option 1 option · excerpt
{
"key": "with-gift",
"display": {
"title": "With a pair of socks"
},
"lines": [
{
"role": "main",
"quantity": 1,
"purchase": {
"type": "one_time"
}
},
{
"role": "gift",
"quantity": 1,
"purchase": {
"type": "one_time"
}
}
],
"pricing": {
"promise": {
"firstChargeCents": 10000,
"renewalChargeCents": null
}
}
}How Offer Suite validates, versions and publishes a document like this one: offer documents.
Questions
Is a gift with purchase profitable for footwear brands?
With a pair of socks, an order at $100.00 loses $6.15 on these costs, $9.33 less than without it. It is profitable while the order still earns, and worth giving only if it brings buyers.
How much does a free gift have to lift conversion for footwear brands?
No lift is enough here: with the gift, the order earns nothing.