"I'll be honest with you, I've never seen anything like it before. It's crazy," a 49ers store salesman told Fairfax Media. "Not only do I watch pro football, but I watch other sports too and this is unheard of. It's incredible, his jersey is in high demand right now. He's exceeded a lot of expectations transitioning into NFL football. He's a wonder kid. He's in such high demand right now. Flying off the shelves: The white and black options available at the 49ers' online store. Credit:shop49ers.com "The jerseys are custom made and they are going off the shelves. We started making some custom jerseys for him about two weeks ago just prior to the first preseason game. But the media following and buzz around him have people interested. I've made about 10 or 15 custom jerseys myself. People are coming in and asking for Hayne 38 and waiting 40 minutes to get that jersey custom made and tailored to their size. It's grown men, it's women. Everyone wants a piece of him at the moment." On the club's official merchandise store website, Hayne's jersey leads the page with five different options available to men ($US99.95), women ($US94.95) and youth ($US69.95). At the moment his jerseys are all being custom made, however the 49ers have made contact with apparel partners Nike and are ready to begin bulk production.

"We have a back-up plan in place, yeah,' the 49ers store salesman said. Number 38: Hayne will have another chance to impress against Denver on Sunday. Credit:49ersshop.com "For now we're making that many customisations that we're trying to get ahead. But Nike are in the work of having his jersey mass produced to go on sale. Of course the final signing would be the Chargers game in our house on the 3rd of September. If he makes the squad then Nike will push the button on mass producing those jerseys. We have the jerseys and it won't be long before we have personal custom items like playing cards and T-shirts." Figures on the number of Hayne jerseys sold are unavailable given they have all been custom made in stores, but it is estimated it's gone well beyond three figures already. The hype around Hayne continues to go grow back home and abroad, with many fascinated by the story of the kid from Minto.

"The limelight and the story. He's come out of nowhere and transferred his skills excellently," the 49ers store representative said. We have the jerseys and it won't be long before we have personal custom items like playing cards and t-shirts. He's got a great work ethic. The Niners fans are trying to figure out how he works. I follow rugby so I knew who he was before he wore our colours. It's this running ability - they are amazed with what they see. How does he do it, they ask. It's quite a story." It's the second time this year there's been a rush on jersey sales for an unheralded Aussie in the US after Cleveland Cavaliers' Matthew Dellavedova became the highest-selling NBA singlet during the finals.