Questions? Call Toll Free 1-877-322-7387 for Live Customer Service

After adding your helmet to your cart, you will be able to choose your free helmet liner.

Free Extra One K Helmet Liner With Purchase

One K Defender Helmet

More Views

One K Defender Helmet

SKU: 202454

Availability: In Stock

Reset Configuration
One K

Free, fast shipping. In stock items usually ship in 24 hours! Most orders over $100 ship free. Learn more..

Price match guarantee. Shop with confidence, Adams has a price match guarantee on most items. Learn more

60-day return policy. Not happy with your purchase? No problem - send back for a full refund. Learn more

Still have questions? Call live customer service at 877-322-7387 during business hours or

click here to open a support ticket



The One K Defender Helmet boasts the perfect synergy between advanced technology and aesthetically pleasing design. The Defender helmets have been designed with enough added features to please even the most discriminating equestrian, combining comfort, style and tradition into a helmet that will be a favorite of riders across disciplines. Additional features of the Defender helmet include:

  • Polycarbonate and advanced ABS composite outer shell
  • Injection molded shell design
  • Washable, quick dry, moisture wicking, anti microbial liner
  • Stainless steel mesh
  • Comfort padded harness with synthetic suede lining, hook and loop adjustment and Fastex buckle
  • Two side, two front, one back and two center stripe vents
  • ASTM F1163-04a, CE EN 1384/SEI certified


  • Matte black with matte black vents
  • Glossy black with silver vents
  • Additional Info

    Additional Info

    Brand One K
    Manufacturer English Riding Supply
    MPN 468259
    Country of Manufacture No
    Age Group No
    Gender No
    Lining No
    Panel Type No
    Seat Size No
    Thickness No
    Tree Width No
    Sale Items No
    Helmet Type Show
    Size Chart One K Helmets Size Chart
    Video 1 Title Why Jonathan McCrea Loves This Helmet
    Video 1 Source Url
    Video 2 Title One K Helmets - Correctly Fitting A Helmet With Kim Gentry
    Video 2 Source Url


    Customer Reviews (3)

    Long oval fits GREATReview by TJ
    I have a miserable time getting helmets to fit... the long oval works great, and in a nice looking helmet that doesn't break the bank! (Posted on 2/3/2016)
    My favorite helmet everReview by Denise from Virginia
    I tried this helmet on at Equine Affair, but they didn't have this style. I love the matte finish so it stays clean. Very, very comfortable and the removeable liner is a great idea. I was surprised it snapped into the helmet instead of velcro, so it is always in the same spot when you put it back in.

    I have gotten a ton of compliments on this helmet! WHEN does that happen.
    (Posted on 9/3/2015)
    Finally - a helmet that fits!!Review by Susan from Willard
    I have been through just about every brand of helmet trying to find one that will fit my daughter. She has a large head and within her hairline, it's round. The forehead area is more oval. Oval helmets wouldn't fit and even the rounder ones wouldn't. We finally settled on a GPA last summer (well over $400) and it hurts her head - especially in the heat. I saw the One K and thought it was worth a try. I loved the idea of the removable liner and bought an extra to make washing easier. She's been wearing the helmet for a few weeks now and no complaints! It's miserably hot too! Today, her trainer noticed and thought it was so nice looking that she wanted to try it. Really is a lovely helmet and thank you, Adam's, for carrying the size 2XL! By the way, we got the black matte. (Posted on 8/19/2015)

    Write Your Own Review

    You're reviewing: One K Defender Helmet

    How do you rate this product? *

      1 star 2 stars 3 stars 4 stars 5 stars



    Use spaces to separate tags. Use single quotes (') for phrases.

    You may also be interested in the following product(s)

    Charles Owen GR8 Helmet

    Charles Owen GR8 Helmet

    4 Review(s)
    Charles Owen AYR8 Helmet

    Charles Owen AYR8 Helmet

    3 Review(s)
    Charles Owen Custom GR8

    Charles Owen Custom GR8

    1 Review(s)
    Contact Us