Thunderbolt HI4 Black (Carbon) Surfboard, Grey/Black
FINS:
Fins not included.
Designed with a 5-fin setup for maximum versatility.
FCS Harley XL Tri Set: Best for everyday surf.
FCS Harley XL Quad Set: Ideal for open faces or hollow waves.
Like it fast and loose? Run the quad on smaller days for extra speed.
[Need help choosing fins? Call us — we’ll get you dialled in.]
DIMENSIONS & VOLUME:
• 9’1" x 22 9/16" x 2 ¾" – 64.5L
• 9’3" x 23" x 2 7/8" – 70.1L
(Recommended for intermediate to advanced surfers seeking a high-performance longboard that noserides and turns like a dream.)
Need Help With Sizing or Setup?
Call us on (09) 427 9552 ext 2, 10am–5pm, 7 days. Our team can help match the HI4 to your style, waves, and ability.
Bundle & Save – Underground Surf Combo Deals
• Spend $750+ – 10% off accessories/wetsuits → combo10
• Spend $1500+ – 15% off → combo15
• Spend $2500+ – 20% off → combo20
(Combo applies to full-price surf accessories like fins, bags, grips, leashes, and wetsuits. Discount excludes the board and other sale items.)
We check every combo order to make sure sizing and fit are right—if we spot a mismatch, we’ll reach out before we ship.
5 Reasons You Need the HI4 – Thunderbolt Black
Harley’s Everyday Go-To Performance Longboard
The HI4 is Harley Ingleby’s most user-friendly performance longboard. It’s wider through the nose and tail, with more curve between your feet for looseness and easy transitions. If you want a board that turns effortlessly and feels alive underfoot, this is it.
HP Rocker + Flipped Tail = Pocket-Ready
Using the same continuous HP rocker found in Harley’s world tour boards, the HI4 adds a subtle tail flip in the last 6 inches. This keeps it tight in the pocket, even with wider dimensions. You’ll feel comfortable stalling, lifting, or hitting tighter transitions with control.
Walks & Noserides Like No Other in the HI Series
Thanks to its wider nose, nose concave, and balanced rocker, the HI4 is the easiest board in the series to walk and noseride. Whether you’re practicing your cross-step or locking into a 10, it delivers long hang time without sacrificing turning speed.
Thunderbolt Black Construction – Light, Fast, Built for Power
With a full carbon exterior and internal flex tuning, Thunderbolt Black is the highest performance construction in the Thunderbolt range. This tech gives the HI4:
- Faster reflex and spring out of turns
- More control under pressure from powerful or steep waves
- A stiff, responsive feel that suits heavier footwork and vertical surfing
It’s the board Harley trusts in competition—strong, fast, and precise.
Perfect for NZ’s Punchy Pockets & Clean Walls
The HI4 is made for New Zealand’s variety—from east coast runners to peaky west coast sections. It paddles into waves early, hangs tight in the pocket, and trims clean through steep sections. Whether you're logging Raglan walls or threading a fast section at Piha, the HI4 stays stable, responsive, and loose.
What is Thunderbolt Black?
Thunderbolt Black is the most performance-driven construction in Thunderbolt Technology’s lineup. Developed by Yu and Tamotsu Sumitomo over 40 years in Japan, this tech offers:
- Full carbon lamination for unmatched strength and stiffness
- Multi-component flex-engineered stringers built into the EPS core
- Ultra-lightweight feel with fast paddle acceleration
- More control and drive under heavy-footed surfing or in fast waves
- Built for power, speed, and durability
It’s what Harley rides when performance is non-negotiable—and it’s designed to outperform both PU and traditional epoxy builds in strength, reflex, and ride quality.
Is the HI4 Right for You?
Ask yourself:
- “What’s the best turning longboard I can still noseride?”
- “What board can I trust in punchy or crowded surf?”
- “Is there a high-performance longboard that’s also forgiving?”
If you want a longboard that feels shortboard fast, locks in noserides, and handles real surf, the HI4 in Thunderbolt Black is the upgrade you’ve been waiting for.
Flexible Payment Options
• 12 Months Interest-Free with Q Card
• Afterpay available
Apply online or in-store.
Thunderbolt Technology utilizes advanced materials and technology to decrease weight while enhancing performance, flex characteristics, board control, and durability. Mass-produced epoxy boards are corky and stiff. While light and durable, they simply don’t ride well. But Thunderbolt’s hand-built boards take superior epoxy materials to an entirely different level. These boards provide the feel and sensitivity of a good poly board, but deliver performance far beyond traditional epoxy pop-out constructions. Indeed, those who ride these high-tech epoxy boards claim they actually feel better than polyurethane.
Thunderbolt Surfboards are 100% hand layups. They begin with an EPS foam core with multi-component carbon fiber stringer systems that produce engineered flex and twist for a more lively, responsive performance. Proprietary designs employing internal carbon fiber components are then arrayed in the deck and bottom of the deck for precise flex control and strength.
The core shield PVC provides flexible protection to increase strength and durability without compromising the flex and twist characteristics built into the blank. With ample carbon fiber and fiberglass in the deck, bottom, and rails, these boards both outperform and outlast traditional PU boards and other epoxy designs.
SAVE ON A COMBO DEAL: Buying a new board? Why not make it a combo, just use the relevant promo code at the checkout. Please note we review all combos and if there is a better option, or wrong fitting item ie bag or leash, then we will make contact and check if you want to change that item. Otherwise, the best way to get advice on boards is by phone 094279552 ext 2 10-5pm 7 Days and we can chat while you scroll online.
Spend $750 get 10% off all accessories and wetsuits: combo10
Spend $1500 get 15% off all accessories and wetsuits: combo15
Spend $2500 get 20% off all accessories and wetsuits: combo20
*Combo will apply to accessories on the surf website like bags, grip, leash, fins and wetsuits. The discount will not work with other discounted items or with the board purchased.
12 Months Interest-Free Finance with Q Card. Simple and Easy to apply. Find out more about this, plus Afterpay HERE.
All orders will be shipped from Underground Skate Limited - 306 Hibiscus Coast Highway, Orewa, 0931
If you have any questions about shipping, then please email us on info@undergroundsurf.co.nz 9am - 3.30pm Weekdays or use our website chat feature and we'll be happy to help you out.
All items are packaged with extreme care, under CCTV surveillance. As freight is handled by third parties, we advise you to thoroughly inspect your Good(s) for damage in transit.
Parcels are not collected on weekends, so orders received after 1pm Friday will be shipped the following Monday otherwise 'click and collect' is available from our store. (Please confirm your order is ready before driving to the store.)
NEW ZEALAND:
CLICK & COLLECT is of course free from our store, just select this option at the checkout and you can collect during our stores opening hours.
For smaller items:
- $10 – NZ WIDE VIA ARAMEX (Non Rural)
- $15 - NZ WIDE VIA ARAMEX (Rural)
- $25 – NORTH ISLAND VIA NZ POST EXPRESS – excludes bulky* items.
- $50 - SOUTH ISLAND VIA NZ POST EXPRESS – excludes bulky* items.
Address Checker - Please check your address to avoid delays if you select non rural and you are rural https://www.addresscheck.co.nz
We use a standard Aramex Courier service to ship your goods nationwide, this is a non-signature service. We suggest under “Shipping Instructions” you leave a note as to where the courier should leave your parcel if you are not there on the day of delivery.
NZ POST EXPRESS – non-signature service, tracking will be sent directly from NZ Post when your order is booked with this service. Cut Off – 3.30pm Weekdays. We are unable to send bulky items via NZ Post.
You will receive an invoice and tracking number in an e-mail once your order is dispatched from Underground in Orewa Auckland. Once the order has been collected by our courier, your tracking number will be live.
*BULKY ITEMS – excludes all Complete Skateboards, Wide Brim Straw Hats, Surfboards, all Paddle Boards, all Board Bags, SUP Paddles, SUP Carts, Body Boards.
For Surfboards, Sups and larger items:
- $49.99 NZ WIDE – Surfboards & Foil Boards
- $99.99 NZ WIDE – Sups
Please note:
- Boards 7'2 and under will be delivered using Aramex Couriers, we advise getting it shipped to your closest Aramex depot where possible. You can check out the depots here - https://www.aramex.co.nz/contact-us/aramex-depot/
- Boards 7'4 and larger will be delivered to the nearest Titus Transport Depot or Depot Partner for you to collect. They have depots in most main centres throughout New Zealand. Or we can have them delivered direct to your door at your cost and can provide a shipping quote upon request.
For Shipping Costs on Surfboards, Foils & Sups direct to your own address please contact us via our Chat Feature or emails us on info@undergroundsurf.co.nz and we'll be happy to help you out.
Unfortunately, we are unable to deliver any large items such as Surfboards or SUPs to rural areas.
SURFBOARDS, SUPS and FOILS – please do not sign for your package if the packaging is damaged in anyway as Underground Surf will not be liable or any damages that are signed for and accepted on delivery.
All boards are packaged under CTV surveillance and are marked as Fragile with a “Do not sign for if Damaged” A4 note.
If you have any questions, please contact us via our Chat Feature or email us on info@undergroundsurf.co.nz and we'll be happy to help you out.
AUSTRALIA:
- FREE SHIPPING on Orders over $200.00 – excludes bulky* items.
- $29.99 on Orders under $200.00 – excludes bulky* items.
*BULKY ITEMS – excludes all Complete Skateboards, Wide Brim Straw Hats, Surfboards, all Paddle Boards, all Board Bags, SUP Paddles, SUP Carts, Body Boards.
We use a standard Aramex Courier service to ship your goods Australian wide, this is a non-signature service. We suggest under “Shipping Instructions” you leave a note as to where the courier should leave your parcel if you are not there on the day of delivery.
You will receive shipping notifications directly from Aramex once your parcel as been booked for collection.
All prices below and on our website are in New Zealand Dollars. To view the exchange rate - https://www.xe.com/currencyconverter/convert/?Amount=1&From=NZD&To=AUD
If you have any questions, please contact us via our Chat Feature or email us on info@undergroundskate.co.nz and we'll be happy to help you out.
REST OF THE WORLD:
At this stage we only ship internationally to Australia, but we can look into sending our products all over the world for you just email us on info@undergroundsurf.co.nz and we'll happily give you a quote.
CUSTOMS AND DUTY CHARGES:
If you are purchasing Internationally then we recommend that you review the following resource to assist you in calculating the charges you may be subject to upon arrival of your parcel to your country/local area: dutycalculator.com
International orders may be subject to local charges. Any customs or import duties and associated fees are charged once the parcel reaches its destination country. These charges must be paid by the recipient of the parcel. We have no control over these charges and cannot predict what they may be.
Underground Surf cannot be held responsible for any additional charges on your order, nor can we accept a return of the order in this case.
Customs policies vary widely from country to country, so please contact your local customs office for further information. If you refuse to pay these charges your parcel may be abandoned, and Underground Surf will not be held responsible for any loss of funds as a result of this occurrence. We cannot mark International orders as a gift in order to bypass or reduce any customs fees. This is an illegal practice and as an established business we will not do this.
TERMS & CONDITIONS
- If you are returning a Free Freight item for a Cash Refund, we will not refund our freight cost, which is a minimum of $10 or what you were charged. Even if you qualified for free freight.
- We will not accept any claim for damage on any Surfboards or Sups after they have been signed for by the customer. Inspect before signing.
- We will not refund on any finance sale this includes AfterPay and Q Card. We will only allow exchange or credit unless there is a mistake at our end in shipping or stock holding.
- Should you select an item that is marked as 'Pre-Order’ and pay using Afterpay a 5% cancellation fee will apply that covers our costs if you cancel this because you did not read it correctly.
- By selecting any item that is marked as 'Pre-Order’ you allow a grace period of 14 days from the original date before we will offer a refund.
- We will not accept returns of any sort from any international order.
- We will cover the cost of return freight from our store to you on one exchange for size. Any further exchange in size will be charged at freight cost + $10 handling fee. We will not offer a refund after an exchange of size has taken place. This Excludes Surf / Sup boards, surf bags and international orders.
- Should there be a miss-pick, the wrong item sent, the item is faulty, or the description/image is significantly wrong we will cover freight costs both ways or provide a refund.
- Any item returned to us without swing tags, with pricing removed, or not 100% as it was shipped out to you will have a restocking fee of 10-30% depending on how that item is returned. This will be at our discretion.
- We will not accept returns for any 'In Warehouse' customer orders. This stock would have been brought in at a significant cost to meet your order.
- We will not be responsible for any change of address that takes place after the order is processed. We will provide you the tracking details to contact the courier and arrange this.
- We will not be responsible for the loss of any parcel where there is a shipping request to leave in a place, doorstep etc. Once the courier says it is delivered any claim for anything missing item will be between yourself and the courier company. We will offer assistance where possible.
- We will not issue any refund in the event of a delayed courier unless we are informed that it must be to you by a certain date and time. We cannot be responsible for lack or planning on your behalf.
- We will provide courier details and tracking information upon sending the order. This is your responsibility to track this and ensure it comes. We are happy to assist but you must email us the order number.
- Any special courier charges such as Saturday delivery or Rural delivery excess will not be refunded under any circumstances.
- Returns will ONLY be accepted via our online portal. Any damage or loss of any returned item is at your risk. We strongly advise having it tracked and signed for.
- Sale or Combo surfboards and sups will incur extra freight charges that match our cost prices for this. We will make contact with you. Items over 7'4 in length can only be sent to local main centre depots. We cannot send these to Rural Delivery addresses. Home addresses will incur a surcharge.
