SDM Windsurf Fin for Freerace and Slalom
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The Dynafiber SDM Alu Inox is the SDM mast extension for those who sail in freeride, freerace and slalom with large, cambered sails. The T8 aluminium tube and stainless steel base remain perfectly rigid even under the extremely high downhaul tensions of race sails.
Available in lengths of 32 cm and 46 cm. An affordable alternative to carbon SDM extensions.
Main features
- Stainless steel base and block housing: does not compress or deform with 7.5 m² sails and larger.
- Large-diameter steel blocks for smoother downhauling.
- Metal release button that does not break or jam with salt and sand.
- T8 aluminium tube with thick walls: no flexing even under full load.
- Euro Pin mount and Marlow Formuline top included.
Technical specifications
| Feature | Details |
|---|---|
| Diameter | SDM (standard diameter) |
| Tube | T8 aluminium |
| Base | Stainless steel |
| Mount | Euro Pin |
| Top | Marlow Formuline |
| Lengths | 32 cm, 46 cm |
Q&A – Frequently Asked Questions
Q: Who is this extension designed for?
A: For freeride, freerace and slalom riders who use SDM masts and large sails, where rigidity and resistance to high downhaul tensions are required.
Q: Which length should I choose?
A: It depends on the difference between the sail's luff and the mast length: the 46 cm offers more range and flexibility in matching the mast and sails.
Q: Is it compatible with RDM masts?
A: No, it is an SDM extension: for RDM masts, choose the RDM Alu Inox version.
Q: What advantage does the steel base have over a plastic one?
A: It does not compress or crack under load, lasts longer and is immune to oxidation.
ZZZSURF Shipping and Delivery
Buy with peace of mind: with ZZSURF you get your windsurfing, wingfoil, kitesurfing and watersports products delivered directly to your doorstep, anywhere in the UK and most European countries.
Shipping Times
- Italy: Standard delivery in 24/48 business hours from shipment for most items in stock.
- Europe: delivery in 2-5 business days depending on the country of destination.
- For islands, remote areas or bulky items (boards, SUPs, foils, rigs, masts and booms) delivery time may vary by 1-2 business days.
Shipping Costs
- Italy: Free shipping on orders over $50. For lower orders, a shipping charge may apply.
- EU countries: Cost starts from €24.90 for orders under €200, the price however may vary depending on country and volume of products. The exact calculation is displayed during checkout.
- For bulky products (boards, sails, foils, SUPs, kayaks, etc.) a surcharge may be required. It will always be clearly communicated prior to order confirmation.
Shipping Methods
- We ship with specialized express couriers (GLS, BRT, DHL, UPS, SDA, etc.), selected according to product type and delivery area.
- All products are packed carefully and, where necessary, with reinforced packaging to ensure maximum safety during transport.
- You will receive tracking via email/SMS as soon as the shipment leaves our warehouse.
Pickup at Headquarters
- You can pick up your orders for free at our ZZSURF warehouse in Gallarate Via Mameli 48 (VA) Italy - Please note this is not a store but a pickup point where orders already placed on the site can be picked up.
- You will be notified as soon as your order is ready for pickup.
Important Notes
- Always check the integrity of packages upon delivery and sign with reserve in case of damaged packaging.
- For any doubt or urgency, you can contact our customer service: info@zzsurf.com or WhatsApp directly from the website
- We also ship to Switzerland and UK: contact us for a customized quote.
Methods of Payment on ZZSURF
On ZZSURF, operated by Twoside srl, you can choose from several payment methods, all of which are secure and designed to provide you with maximum convenience:
Credit Cards:
Major credit and prepaid cards are accepted, including Visa, Mastercard and American Express. This method allows you to complete your purchases quickly and securely.
Klarna:
With Klarna you have the option to purchase now and pay off the amount later, choosing from various installment options as needed. A credit card is required to complete payment through Klarna. The maximum amount allowed, including shipping costs, is €1,500.
PayPal:
Paying with PayPal will allow you to make secure and fast transactions without having to re-enter your card information each time. In addition, in some situations, PayPal allows you to split the payment into convenient installments directly from your account.
Bank Transfer:
If you prefer, you can also pay by bank transfer. You will receive all the necessary details when you place your order. Shipment will be made only after verification of receipt of payment.
After placing your order you will need to make the transfer payable to : Twoside srl , IBAN IT74M0326850240052341838010 indicating the order number
Security of Transactions
All payments on ZZSURF are secured using SSL (Secure Socket Layer) technology, which protects your credit card information. During order completion, 3D Secure verification is also activated, which adds an additional layer of security by requiring additional confirmation via web, app or SMS. These measures allow you to shop with confidence.