Apparel & Accessories · Final Sale
18-Hour Jersey Brief
Mackweldon · sold by Mack Weldon · $9.99–$21.99 · in stock
Get the underwear that made us famous: insanely soft 18-Hour Jersey, designed for any and every day.
| Option | Price | Stock | |
|---|---|---|---|
| Contest Blue / L | $9.99 | out of stock | |
| Contest Blue / XL | $9.99 | out of stock | |
| Bluelight / XXL | $9.99 | in stock | Order via Kaupia → · Buy at Mack Weldon |
| Bluelight / XL | $9.99 | out of stock | |
| Bluelight / L | $9.99 | out of stock | |
| Bluelight / M | $9.99 | out of stock | |
| Bluelight / S | $9.99 | out of stock | |
| Purple Sky / S | $9.99 | out of stock | |
| Purple Shade / XXL | $9.99 | in stock | Order via Kaupia → · Buy at Mack Weldon |
| Purple Shade / XL | $9.99 | out of stock | |
| Purple Shade / L | $9.99 | out of stock | |
| Purple Shade / M | $9.99 | out of stock | |
| Purple Shade / S | $9.99 | out of stock | |
| North Star Constellation / XXL | $9.99 | in stock | Order via Kaupia → · Buy at Mack Weldon |
| North Star Constellation / XL | $9.99 | out of stock | |
| North Star Constellation / L | $9.99 | out of stock | |
| North Star Constellation / M | $9.99 | out of stock | |
| North Star Constellation / S | $9.99 | out of stock | |
| Purple Potion / S | $9.99 | out of stock | |
| Purple Potion / M | $9.99 | out of stock | |
| Purple Potion / L | $9.99 | out of stock | |
| Purple Potion / XL | $9.99 | out of stock | |
| Purple Potion / XXL | $9.99 | in stock | Order via Kaupia → · Buy at Mack Weldon |
| Purple Sky / XXL | $9.99 | in stock | Order via Kaupia → · Buy at Mack Weldon |
| Purple Sky / XL | $9.99 | out of stock | |
| Purple Sky / L | $9.99 | out of stock | |
| Purple Sky / M | $9.99 | out of stock | |
| Mint Julep / XXL | $9.99 | in stock | Order via Kaupia → · Buy at Mack Weldon |
| Mint Julep / XL | $9.99 | out of stock | |
| Mint Julep / L | $9.99 | out of stock |
Prices and stock from mackweldon.com’s public catalog, last checked 2026-11-03 18:52 UTC. “Order via Kaupia” shows the delivered price to your zip (item + the store’s shipping + est. tax) and places the order through Kaupia with a delivery guarantee; “Buy at the store” goes to the store’s own checkout. Agents: JSON at https://api.kaupia.com/v1/product?id=kp:a42adb4c-40f8-4881-b816-c072cce5b50a; delivered price GET /v1/quote; order with POST /v1/orders or MCP place_order.