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Adidas Ultra Boost 21

€115.00 €180.00
Size Guide Right

We have run out of stock for this item.

Adidas has managed to outdo itself yet again by improving on the masterpiece that was the Ultra Boost 20. Though subtle, the Ultra Boost 21 features updates that will help take your running to the next level.
What's New
  • 6% more boost in midsole
  • Updated upper is sock-like for a more precise fit
  • New Torsion System
Forget the "less is more" philosophy. In the case of the Ultra Boost 21, more is more. Containing 6% more Boost than the outgoing version, the Ultra Boost 21 is both more cushioned and responsive to make running feel akin to riding a wave than pounding the pavement. In order to help manage all that energy, the upper has a sock-like fit that is highly supportive yet extremely comfortable.
With forward-propulsion always on the crosshairs, a new Torsion System called LEP has been added to the bottom of the midsole, making it 15% stiffer for a faster snap back from toe-off.
How It Fits
  • Sizing: True to size
  • Midfoot Volume: Medium to low
  • Toe Box Fit: Medium to narrow
  • Arch Height: Medium
For the best fit, we advise customers to avail of our detailed gait analysis service.

Weight: 320g
Stack Height: 33mm/23mm
Heal To Toe Offset: 10mm

  • Boost is a lightweight midsole composed of TPU pellets, delivering an enhanced soft and responsive ride across a wide range of condition.
  • Linear Energy Point (LEP) uses a thermoplastic unit in the midfoot to provide a stable platform and enhanced toe-offs.
  • Continental Stretchweb Outsole offers durable, sticky traction in both dry and wet conditions.
  • Seamless Knit Upper conforms to the foot for unmatched comfort and support.
  • Primegreen Upper is made from recycled materials.
Shipping & Returns



Orders received before 2.30pm will receive same day dispatch subject to stock availability.  Weekend orders will be processed on the next working day. 

How Much:

Purchases over €95 will have free delivery, whereas purchases below €95 are subject to a €4.50 charge. European deliveries are subject to a €10 fee.

Our Shipping Partners:

We use both DPD and An Post as our delivery partners. While we aim to get all customers their shipment within 24 hours of ordering, however we do have exceptions.  Please allow 3-5 working days for delivery within Ireland and if you have not received your order by this time please contact us by emailing sales@therunhub.ie referencing the order confirmation number.

Click and Collect:

Orders placed before 4pm will be ready for same day collection in our Ashtown store.  If you wish for a product to be collected from another store, then we may need to carry out an inter-store transfer and we ask that you allow additional time for this to be processed and ready.  You will receive a confirmation mail/call to notify you when your order is ready for collection.

Import duties and taxes on international orders will be assessed by local officials and billed to you separately if applicable. Please contact your customs office for information on duties, taxes and restricted items. Unfortunately we have no control over these charges and cannot predict what they may be. We are unable to reimburse any costs incurred regardless of the circumstances


The Run Hub will not be held responsible for any delays encountered by DPD or An Post.  We strive to get most orders out with next day delivery, but at times our courier partners may experience delays within their own service.   If you are contacted by DPD/An Post personnel and you request delivery to an alternative address to that submitted with your order, you do so at your own risk.  The Run Hub will not be held responsible for any loss or damage to deliveries in this case.

Product Guarantee:

In the unlikely case that you find a fault with your product, please return it to us with a note detailing the issue.  If we find a manufacturing, fault we will happily replace it or refund you.  We aim to deal with returns within 2-3 days of receiving them.  For some faulty returns we may need to seek the opinion of the respective brand.  We will advise you of this referral and the additional timeframe that may be required.  Your statutory rights will not be affected




We’ve extended our usual time for returns. Any purchases made online between 1 and 24 December 2023 can be returned up until 14 January 2024.

We value you as a customer and understand that sometimes you may need to return a product for various reasons.  With this in mind, we try to make this process as easy and transparent as possible.
  • By ordering from our website, you agree that you can return or exchange the product(s) within 30 days of your purchase.
  • Proof of purchase will be required with the returned product for refund or exchange.
  • If the product is damaged or soiled upon return, you will be charged for the cost of repair or replacement.  For this reason, we recommend that you use a trusted courier provider to return your purchase to us in the same condition as it was sold.
  • The customer is responsible for shipping costs back to The Run Hub.
  • For in-store purchases, we offer customers the options of an exchange or credit note only.
  • Refunds for online purchases can only be processed if the product is returned to our Ashtown store, Dublin, D15Y577.
  • Refunds for online purchases will be issued within 7 days of goods returned, subject to the above conditions.
  • Online returns for exchange can be returned to any store. We advise that you call the store in advance to ensure the size you require to exchange for is in stock.
  • During exceptional circumstances there may be a delay in processing online returns. This will only occur if circumstances outside of our control inhibit our normal business operations. 
  • Returns will be processed via the same method as the original form of payment
  • Please be mindful that some payment providers may take longer than others to refund funds to your account.
How it fits
  • Small
  • Regular
  • Wide
Distance per run
  • Short
  • Middle
  • Any
  • Low
  • Medium
  • Max
Best suited for
  • Trail
  • Road
  • Racing

the run hub's Gait Analysis

Our team takes pride in offering industry-leading customer service, gait analysis, running and footwear advice.

Our main point of difference is our service, part of which involves a personal fitting process called Gait Analysis. Using high-tech scanners and custom video software our highly trained team will guide you through the process and help you understand why we select footwear suited to your needs.

Our natural Gait Analysis is for everyone!