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2021 O'Brien Jr. Siege w/ Z9 Boot + RTP


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US 2.0-7.0
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Sizing Guides
The O'Brien Jr. Siege is the waterski that was built for any kid, from the fearless daredevil who's going to be burning turns within the first few days, to those who like to take their time. Built with a forgiving fibreglass and polyurethane construction O'Brien make the Jr. Siege forgiving underfoot with a comfortable amount of flex to support skiing at beginner speeds, but still stiff enough to turn a buoy in the course. The design principle on the shape of the Jr. Siege is designed to work with the core, creating a ski that will create edge turn and hold with ease, while also creating consistent, comfortable and fast transitions in the turns. All together the O'Brien have developed the perfectly rounded kids ski, one ski to rule them all.

The O'Brien X9 waterski boot is built with base level comfort and ease in mind, taking the core components of a ski boot to make it easy for kids and adults alike. A simple neoprene liner sitting above a plush EVA footbed, give you comfort from underfoot all the way through to your upper ankle. Underneath this is O'Briens signature superlite chassis that gives you the perfect weight balance with your ski.

Waterski Features


  • Flat Spot - Underneath your front foot gives you comfort and stability while also propping you up higher on a platform for control throughout your entire motion from cut to turn
  • Continuous Rocker - Through the tip and tail allows the ski to always provide a constant level of speed across the wash and allows for a smooth comfortable turn, drive through the wash, while still having the ability to easily keep that speed into your leading edge


  • Flex Rating(1=Soft, 10=Stiff) - 5/10


  • Closed Cell PU Core – The most well known of core to waterski’s, with a tighter knit construction to reduce weight, while remaining durable, and providing a slightly softer feel meaning you can ski for longer, feeling less tired, while also getting more flex into turns and less rebound when crossing the wash


  • Fibreglass Laminates – The most forgiving top layer you can get, a simple fibreglass laminate allows the ski to provide a comfortable flex and smooth arcing turns


  • Small Defined Edge Bevel - Makes it easier to turn lean into your edges and hold the edge through the wash


  • Rapid Response Tunnel - O'Briens signature tunnel shape designed to transition from edge to edge with ease and create easier hold through the turns

Other Features:

  • Polished Speed Base - All about promoting greater water flow across the base of the ski to ultimately reduce drag
  • Aluminium Adjustable Drop In Fin


  • Riding Ability: Intermediate
  • Ski Type: Cross-Over
  • Ski Speeds: 32-34Mph


  • (59") - Up to 42Kgs
  • (62") - 36-50Kgs
  • (63.5") - 42-57Kgs


  • Limited Lifetime Manufacturer Warranty

      Boot Features


      • Mid Flex


      • Plush EVA Footbed - Provides comfort underfoot so you cans ski all day long
      • Floating Toe - Allows for easy step in entry as well as greater closure over the foot

      Liner & Lacing

      • Neoprene lined - Sit snugly around your foot to maximise comfort
      • Dual Zone Lacing


      • Superlight Baseplate - Less weight, more powerful


      • 1 Year Manufacturer Warranty
      Sizing Guides

      Here are our links to both sizing guides and buying guides on our products, all these are here to help you make an informed decision on what size or product will work best for you.



      Let’s face it, we all ride hard and the toys we play on are bound to take some abuse. Nearly all manufacturers understand this and provide a warranty against defects and workmanship. Each new product sold by Skiforce is covered by the individual manufacturer’s warranty. Please check the manufacturer’s website for information regarding their specific warranty policy. The manufacturer will make all warranty decisions. All return shipping costs are the responsibility of the buyer. As an Australian Wake and Waterski Retailer we can only warranty products purchased from our store and website. Please have proof of purchase at Skiforce available when dealing with any warranties.


      Step 1. Determine whether the damage should be covered by warranty. Here are a few things that are NOT covered by warranty:

      Normal wear resulting from standard usage that occurs over time. (chipped topsheet, sun faded topsheet, etc)

      Damage resulting from contact with objects. (Rails, kickers, logs, stumps, little kids, skiers, etc.)

      Damage to product resulting from improper care or unnecessary roughness. (throwing it around on the bank, product flying off of board racks, etc)

      Parts, hardware, accessories that were lost or have gone missing AFTER receiving your shipment.

      Step 2. Email us about your warranty and include CLEAR and detailed pictures explaining the problem. Blurry pictures will not be accepted.

      If you have any questions, don’t hesitate to give us a call. We want to see you back out on your product as much as you want to use it and try to get you a response within 48 hours of receiving the product.

      Step 3. We will contact you with further instruction.

      The next step varies by manufacturer and we will provide you with all the details for the next step. If your warranty claim is accepted you will have to ship your product back to us so that we can confirm the warranty with the manufacturer. Return shipping on warranty claims is the responsibility of the buyer. The manufacturer or Skiforce will cover shipping charges on all items replaced or repaired under warranty.

      Let us know if you are in a rush and would like to pay extra for express shipping on your warranty return.
      2021 O'Brien Jr. Siege w/ Z9 Boot + RTP

      2021 O'Brien Jr. Siege w/ Z9 Boot + RTP

      US 2.0-7.0